Add a comment and share your answers to HW4.

Do you agree with the answers already posted?

Do you agree with the answers already posted?

What questions do you have about HW4?

What questions do you have about your fellow students' answers?

What difficulties did you encounter with this homework?

## 99 comments:

1. 45.8 mph

2. 46.6 mph

3. 25 mph for 275 mi and 75 mph for 275 mi

4a. last two

4b. hour 5

4c. at around 6 hours because at this time the graph has the highest slope

(period 2)

1.) 55mph

2.) 57.6mph

3.) it was going 25mph for 275 miles due to rail construction or something, then sped up to 75 mph for 275 miles.

4.a) the last two hours

b) hour 5 (~4:45)

c) wherever the highest slope is, but around the middle, I'd say, because at both ends of the graph, the slope is decreasing because the train is either speeding up or slowing down

1. 55 mph

2. (About) 58 mph

3. (This one was really fun!)

40 mph for 1.5 hours

60 mph for 1.5 hours

and 50 mph for 8.2 hours (8 hours, 12 minutes- I think)

4a. The last two hours (I think...)

4b. Between hours 5 and 6

4c. 5.5 hours into the trip (I think...)

1. 55mi/hr

2. 65.3mi/hr

3. For the first 5.5 hours the train went 60 mi/hr and went 330 miles while doing so. then the next 5.5 miles the train went 40 mi/hr and went 220 mi while doing so.

4a. last 2 hours

4b. from hours 5-6

4c. 5.5 because it is right after the graph increases the most in its slope and before it begins to decrease in its slope.

1. 55 mph

2. About 58 mph

3. 40 mph for 5.5 hours, 220 miles

60 mph for 5.5 hours, 330 miles

11 hours and 550 miles

4a. last two hours

4b. Hour 5

4c. Between 5 and 6 hours

1. 55 mph

2. 57.65 mph

3. The train traveled at 60 mph for 5.5 hours. Then, it starts to rain, so it (the train) slows down to 40 mph for the rest of the trip.

4a. The last two hours.

4b. 5-6

4c. 5.5 hours, because this is the point that is right at the middle of the curve.

1. 55mph

2. Approx. 57.65moh

3. 45mph, covering 450mi over 10 hours, and then one hour of HYPER-DRIVE, where the train covers the last 100mi in one hour, going 100mph.

4a. The last two

4b. Hours 4-5.

4c. About 5.5, it looks the steepest there.

1. 55 mph

2. ≈ 57.647 miles

3. 1st 5 hours at 38 mph = 190 miles

2nd 6 hours at 60 mph = 360 miles

Total = 550 miles

4a. Last 2 hours

b. From the 5th - 6th hour

c. Part right before the 6th hour because that is where the graph hits the steepest point in the graph

1. 55 miles per hour

2. 57.65 miles per hour

3. The 5:00 am train averages 50 mph for the first seven hours. At 12:00 noon the train starts to speed up at 60 mph till 2:00 pm. The train decides to slow down to 40mph starting at 2:00 pm till 4:00pm.

4a. last 2 hours

b. between hours 5-6

c. between hours 5-6

1st Period

1. 55 mph

2. about 57.65

3. 30 mph for the first 5 and a half hours (165 miles) then 70 mph for the last 5 and a half hours

(385 miles)

4a. last 2 hours

4b. 5-6

4c. between 5 and 6

1. 45.8 miles

2. 46.7 miles

3. it went 75mph the first half then slowed down to 25mph the second hlf (i think this is what the problem asked for)

4. a- faster during the last two hours averaging about 100 miles per hour

b- between hours 4and 5 the train went fastest

c- at about 5.5 hours the train is going fastest because the slope is the at an extreme angle

1. 55 mph

2. ~58 mph

3. first half 60mph->330mi

second half 40mph->220mi

4a.last2 hours

4b.between 5-6

4c.around 5-6

1. 55mph

2. 57.64 mph

3. The train left for Pennsylvania at 5AM. It took 550 miles to get there. For the first 5 hours, the speed of the train was constant at 50 mph. At 10AM , 250 miles were traveled. Then the train rode at 45 mph. By 12PM, the train slowed down again and was running at 30mph. At 2PM the train returned to the original speed of 50 mph. The train arrived at Pennsylvania at 5PM.

4a. The last two hours.

4b. Hours 5-6

4c. I would choose 5-5.5 hours because it is at the middle of the time elapsed and at the middle of the miles traveled. Perhaps because the train was gaining pace at this point because it was in the middle of the trip [not the end or the beginning].

I AGREE WITH ALL CORECT ANSWERS ABOVE

1. 55mph

2. 58mph

3. first half 60mph->330mi

second half 40mph->220mi

4. a)last two hours

b)Hours 5-6

c) somewhere between hours five and six because the line looks the steepest there, that means the obbject is moving the fastest.

I AGREE WITH ALL CORECT ANSWERS BELOW

1.55 mph

2.60 mph

3.The train traveled 50 mph for three hours, then 51 mph four hours, 48 mph three hours, and 52 mph for one hour.

4a. last two hours

4b. hours 5-6

4c. I would choose about hour 5.5 because the train seems to pick up speed here based on the graph.

Traveling Time

1. 55mph

2. about 58 mph

3. For 5.5 hours the train traveled at 60 mph then slowed down and went 40 miles per hour for the remaining 5.5 hours.

4. a. last 2 hours (about 50 mph)

b. during the 5th hour

c. at the start of the 5th hour because that's when the lines curves up the steepest

I think most of my answers match up eith everyone elses....

1. 55 mph

2. 64.075 mph

3. first four hrs- 40 mph, next three hrs- 50 mph, remainder of ride- 60 mph

4a. last 2 hrs

4b. hours 7-8

4c. i would say around hour six b/c thats when the graph starts to get steepest and have the biggest visible change (upward)

Katie Rothas Period 3

1. 55mi/hr (550 miles in 10hrs.)

2. 57.6mi/hr (490 mi in 8.5 hrs)

3. Starts: 51mi/hr for 3hrs conductor slows down to 48mi/hr for 3hrs, then realizes that he is going to run late if he continues at this pace, so speeds up to 50mi/hr for the last 5hrs.

4a. Last 2hrs (50mi/hr)

4b. 4:30-5:30 (100mi/hr)

4c. 5:00 b/c it is in the middle of the hour in which the train was traveling the fastest. At 4:30 it began to speed up and as the train headed towards teh 5:30 marker it slowed its pace (look @ graph).

Nat Iosbaker, who WRULZ!, said...

1) 55mph

2) 49 mph

4a) last 2 hours

4b) 5-6 hours

4c) 5.5 hours at 300 miles because it goes the furthest distance in the least amount of time

3) For half the time, 5.5 hours, the train traveled 49 mph. When the train reached 269.5 miles, which is how far it would have gone at 49 mph for 5.5. hours, it speeds up to 51 mph because the conducter takes some speed up the train drugs (though this situation does not condone drug ussage of any sort) and the train spends the remaining 280.5 miles in peace and funkadelicaness.

Also everyone else is wrong because they're not Nat.

Areli Valencia

1. 55 mph

2. About 58 mph

3. The first five an a half hours the train is going at a speed of forty miles per hour and the next five and a half hours the train will go at sixty miles per hour. So the total distance would add up to 550 miles.

4.

A. The last two hours because it looks steeper than the first two hours.

B. 5-6 hours which I found to be an average speed of 80 mph during that interval.

C. Somewhere in between the fifth and sixth hour.

1. 55 mph

2.60 mph

3.

*49 mph at 6:00 a.m (first 3 hrs)-9:00 a.m

*51 mph at 9:00 a.m (next 3hrs)-12:00 p.m

*50 mph at 12:00 p.m (next 5hrs)-5:00 p.m

4. a. last two hours-more consistent rate

b. During the 5-6 hr period

c. I would pick 5 hrs-

The graph changes shape into a steady incline after this point

1.55mi/hr

2.About 57.65mi/hr

3.40mi/hr for 5 hours, 60mi/hr for 5 hours, 50mi/hr for 1 hour

4a.last two hours

4b.Between hours 5-6

4c.At hour 6 because the line has the steepest slope.

1. 55 mph

2. 57.65 mph

3. At the start of the trip the train went 50 mph. At 12:00 p.m, the train had to slowed down to 40 mph. After a while, the train speed up to 60 mph. Then twords the end of the trip the train slowed back down to 50 mph.

4. a. Last 2 hours

b. Between 5 and 6

c. At 5:30 becasue it is in-between the fastest point of the graph.

While looking at previous posts, I saw that most people have the same basic answer, but small differences occurred due to interpretations of the graph. My answers are:

1) At least 55 mph

2) 57.7 mph

3) 60 mph for 6 hours, 360 mi

38 mph for 5 hours, 190 mi

4) a) Last two hours

b) Between five and six hours

c) I would chose at t=5.5 h because I think between five and six hours the train goes the fastest and 5.5 is in between that time.

1) 55MPH

2) 58 MPH

3)70 MPH for 5 hrs, and 30 mph for 5 hours

4a) last two hours

b) 5-6

c)at 7 hrs

1. 50mph

2. 57.6mph

3. For the first 5.5 hours the traim traveled quickly at 90mph and for the last 5.5 hours the train took it easy at 10mph.

4A. The last two hours

4B. 5-6

4C. The area between 5 and 6 hours because in the same amount of time, as every other hour, the distance traveled was much greater.

Rosa Castillo Period-1

1. 55 miles per hour

2. 51.6 miles per hour

3. 50 miles for 2 hours and 55.5 for 9 hours

4.

a.the last 2 hours

b. Between the hours of 5-6

c. I decided that it would be 5.5 because the line looks the steepest on the graph

1) 55 miles per hour

2)About 58 miles per hour

3)60 miles per hour for 7 hours, 420 miles, and 40 miles per hour for about 3 hours, 130 miles.

4)a.The last two hours

b.between 5 and 6 hours

c. I would choose at 6 hours because the slope of the graph at that point looks steepest, it is also where the train looks like it was going the fastest here.

1. 55 mph

2. Aout 58 mph

3. 50mph for 2hrs (100miles), 51mph for an hour(51miles), 49mph for an hour(49miles), 40mph for 3 hours(120miles),46mph for an hour (46miles),60mph for an hour (60miles), 78mph for an hour(78miles), and 46mph for an hour (46miles)

4.a) The last two hours

4.b) Between 5-6 hours

4.c) I would choose about 5.5 hr. point since I thought the fastest speed was between 5-6hrs.

1. 55 m/h

2. about 58 m/h

3. really long

4.

A.last two hours

B.5-6 hours

c.7 hours

Marlene Juarez, per. 2

1. 55 mi/hr

2. about 57.65 mi/hr

3. The train first travels at 74.2 mph for 4.71 hours. Then it slows down to 17 mph for 2 hours. Then finally, it speeds back up to a speed of 59 mph for 2.82 hours.

The train arrives at Pennsylvania in about 9.53 hours total, giving Abida some time to do whatever she wants to do.

4. a) The last 2 hours.

b) Between hour 5 and 6.

c) Sometime within hour 5-6, since that interval in the graph has the fastest average speed.

1)55 mph

2) 57.65 mph

3)45mph - 5.5 hours

55 mph - 5.5 hours

4) a) the last 2 hours

b) 6-7 HOURS

c) hours 6-7 looks like it has the sttepest slope

1. 55 mph

2. about 58 mph

3. 50 mph for 2 hours, 40 for 3 hours, 49 for an hour, 46 for 2 hours, 60 and 78 for an hour

4. a.last two hours

b.Hours 5-6

c.About 5.5 hours, the line is

steeper within that hour

1. 55 mph

2. 57.6 mph

3. the train traveled 60 mph for 5.5 hours meainign it traveled 330 miles. then it traveled the last 5.5 hours at 40mph meaning 220 miles.

4. last 2 hours

5. 5-6

6. at 5.5 because that's where it looks the steepest.

Oriana Kwok 1st Period

1. 55 miles/hour

2. 57.65 miles/hour

3. 55 miles/hour for 5.5 hours

45 miles/hour for 5.5 hours

4. a) Last two hours

b) 5-6 hours

c) 5 hours because the slope is the steepest there.

Quentin Sledge period 1

1. 55 mi/hr

2. ~ 58 mi/hr

3. I said that the train was going 25mph for the first 275 miles because a train had been derailed earlier in the week due to faulty tracks, then it sped up to 75 mph for 275 miles for the rest of the trip

5. ~ 5-6

6. I would choose the instant where the slope if the graph is the steepest because the slope represents the rate at which the train is moving. So if the slope is high the train is moving very quickly

1) About 55mph

2) About 57.65mph, rounded to 58

3) Abida got on the train right on time at 5:00am. The train traveled 45mph for 4 hours traveling 180 miles from Cincinnati, Ohio. Then the train started to speed up traveling at about 61.7 mph for the rest of the ride there.

4a) Last 2 hours

4b) Probably hour 5-6

4c) Hour 5 or 5.5 because the curve of the line seems must steeper oppose to the other lines

1) 55 mph

2) 57.6 mph

3)

- 40 mph for 7.5 hours

- 60 mph for 4.2 hours

4)

A. The train's average speed was faster during the last two hours of the trip.

B. The one hour period where the average speed was the fastest was around the fifth hour.

C. The train was going fastest at about the fifth hour because it's where the line was steepest.

1. 55 mph

2. 57.6 mph

3. It goes 60 mph for 5.5 hours then fiery balls of hail come out of the sky so it slows down to 40 mph for the rest of the trip.

4a. last 2hrs.

4b.hr. 5

4c.5.5 cuz it’s the steepest point on the graph

1. 55 mph

2. 57.647 mph

3. 100 mph for 4 hours 21.43mph for 7 hours

4.

a) the last two

b) between the 5th and 6th hour

c) at the beginning of the 6th hour because a line tangent to that point would have the steepest slope.

Per. 3

1. 55mph

2. ~58mph

3. 5am-9am 50mph 200mi

9am-12pm 80mph 440mi

12pm-1pm 20mph 460mi

1pm-3pm 45 mph 550mi

4. a). Last two hours

b). 5-6 hours

c). Around the 5th hour because

the slope is the steepest

at this point and continues

at a constant rate, or

speed, until it hits the

6th hour, where it proceeds

to decline.

CHONG CHOI - 4th PERIOD.

1. 55 mph

2. 57.67 mph

3. From 5:00 Am to 10:00 a.m. the train went 40 mph, and from 10:00 a.m. to 3:00 p.m. it went 60 mph.

4. a. the last two

b. between the 5th and 6th hour

c. at the 5.5th hour, because its wen the slope was the steepest.

1.55 mph

2.58 mph

3. Time(hours) / Speed(mph)

1/20

2/20

3/50

4/30

5/75

6/55

7/15

8/80

9/90

10/90

11/25

4.a. During the last 2 hours

b. between 5 and 6 hours

c. it would be somewhere between the 5th and 6th hour because that was also the time period in which the average speed was the fastest.

Maya Wilson- 4th Pd

1. 55mph

2. ~57.674 mph

3. It begins at 60 mph for the first two hours and 30 mph for the last nine

4 a) the last two hours

b) during the 5th and 6th hour

c) at 5.5 hour because based on the graph the slope is the steapest at this point

1. 55 miles per hour

2. Approximately 57.65 miles per hour

3. 60 miles per hour for 330 miles and 40 miles per hour for 220 miles.

4.

a) The last two hours was the fastest average speed

b) 5-6 hours

c) At the the middle of the interval of 5-6 hours because the farthest distance was traveled.

1. 55 miles per hour

2. About 5.65 miles per hour

3. For the first 1.5 hours, it goes 40 mph, then for 5 hours goes 60 mph, and then for the next 3.8 hours the train goes 50 mph.

4. a. The last 2 hours

b. From hours 5-6

c. During hour 5 because the slope of the line is the

steepest.

1) 55 mi/hour

2) 57.65 mi/hour

3) Train averaged 35 mph for the first 5 hours then sped up to 65 mph for the rest of the time

4a) During the last 2 hours

4b) The 5-6 hour period

4c) about 5.5 hour mark

1. 55mph

2. 65mph

3. It goes 25 mph for the first 5 hours and then sped up to 75mph for the rest of the 5 hours.

4. a) The last two hours

b) 5-6

c) 6 because I thought it was on the end of the high slope.

1)55 mph

2)58 mph

3)60 mph for 5.5 hrs and 40 mph for 5.5 hrs

4a)last 2 hrs

4b)5-6

4c)at hour 5 because it looks the steepest

1) 55mph

2) 57.65mph

3) For the first 5 hours the train goes 45mph and for the next 6 hours it goes 55mph.

4a) the last 2 hrs

b) 5-6 hrs

c) about 5.5 hrs because at this time the slope is the steepest.

Conan Huang - Period 1

1. 55 miles per hour

2. about 57.65 miles per hour

3. The train travels at 100 mph for the first hour. Then, a bunny jumps onto the tracks, the conducter is then forced to stop for the super cute bunny. The train contains magic brakes and engines that accelerate and decelerates in no time at all! Conan Huang then throws a bucket of carrots for the bunny to eat. After one hour total, the bunny teleports into Happy Land. The train then accelerates to 50 mph for the remaining distance which takes up 8 hours.

4a. Technically, the graph does not display an accurate representation, but it appears that the last two hours is faster than the first two hours.

b. Once again, simply by eyeing the graph, around hour 5 to hour 6.

c. About 5.5 hours, the line tangent to the curve appears to be steepest vertically.

1) 550miles in 10hrs=55miles/hr

2)57.65miles/hr

3) The train went 35miles/hr for 5 hours then sped up to 60 miles/hr for the remaining 5 hrs.

4a)The train went faster in the last two hours because it went about 50miles/hr (100miles/2hrs=50miles/hr)

b)8-9

c)4 hours and a half because that was a period where the graph looked steeper meaning the train was accelerating.

1) 55mph

2)About 58 mph

3)Go 45 mph for 2 hours, 60 mph for 1 hour, then 50 mph for the rest of the time.

4)

a. It was faster during the last 2 hours.

b)It's speed was the fastest between the 5th to sixth hour.

c)At about 6 because it's before the train starts to slow down and while it is speeding up.

1. 55 mph

2. 57.65 mph

3. well what i got was 20 mph from 5-7 am = 40 mile

and then it went 56.7 mph for the next 8 hours=510 miles, but i now see that they don't average to fifty, even though they still reach the destination in the same time frame.

4a. last two hours-50 mph vs. 40mph

b. between 5th-6th hours

c. I said at the 6th hour because this is the peak of the period with the fastest rate.

1. 55 mph

2. 57.65 mph

3. The train went 49 mph for the first 5.5 hours. Then the train went 51 mph for the next 5.5 hours. This way for each interval of 5.5 hours the average speed is 50 mph.

4.

A. The train went faster in the last two hours.

B. The train had the fastest average speed from hours 6-7.

C. I think at about 6.5 hours. The curve is there indicating an increase in speed that is not constant.

3rd Period

1.) 550/10= 55mph

2.) (550-60)/8.5= 57.65mph

3.) From 5am to 1030am, the train went at 60mph, traveling 330 miles. From 1030am to 3pm, it went at 40mph, traveling 220 miles for a total of 550 miles, and a 50mph average.

4.)

a.) last 2, steeper line

b.) from 5 to 6 hours

c.) 5.5 because it is inbetween 5 and 6 which was the fastest interval.

1. 55 mph

2. 57.65 mph

3. The train leaves the station at 5am traveling a speed of 60 mph for the first 5 hrs. Then it slowed to 40 mph for the rest of the 250 miles.

4a) They're almost appear the same but the last 2 hours seemed to have traveled more. The line is a bit more steep.

b) Probably 5th-6th. The line looks to be the most steep.

c) Probably around 5:30 because as I said in B, I thought 5th-6th was the fastest so before 5 hours, it's still picking up speed but after 6 hours, it seems to be slowing down. So somewhere in the middle of the 5th and 6th hour would probably be the fastest.

1. 55 mpH

2. approx: 58 mph

3. 55 miles/hour for 5.5 hours

45 miles/hour for 5.5 hours

4. a)The train was faster in the last two hrs.

b)Between the 6th hr. and the 7th hr.

c)At the 6th hour because thats at the start of the fastest hour.

Mercedes Jones [1st period]

1.55mph

2.57.6mph

3.55mph for like 5.5 hours

45mph for 5.5 hours

4. a.last 2 hours

b. 5-6 hours

c. 5 hours [basically its the steepest @ that time]

1.55 miles per hour

2.58 miles per hour

3. in 5 hours, he traveled 40mph and in 6 hours, he traveled 60 mph

4.a.last two hours although they were pretty close

b.between 5-6

c.I think 5-6 because it seemed that it started to get steeper after that point.

1. 55mph

2. 57.6mph

3. The train's speed was 30mph. In 3 hours the train has gone 90 miles. 550m minus 90m =460m. 460m/8hrs=57.5mph

4a. In the last two hours. The line is steeper.

4b. 5/6 hours because that is where the line increased more.

4c. 5 because the line is steeper.

1st period

1. 550 milles/ 10 hours = 55 miles/hour

2. 10-1.5=8.5 hours

550-60=490 miles

490 miles/8.5 hours= 58 miles/hour

3. For the first 5.5 hours, the train travels at 40 miles/hour, and travels 220 miles. For the second 5.5 hours, the train travels at 60 miles/hour, and goes the remaining 330 miles.

4. a. faster during the last two

b. from 6 to 7

c. About 5:30, because that seems to be when the line inclines the most steeply.

I don't have any questions. I think I got mostly the same answers as other people. Which means they're probably right. woohoo math!

1. 55 mph

2.57.65 mph

3.The train leaves the station traveling at a rate of 60 mph for the first hour. The next hour it travels for 40 hours. This cycle continues until the last hour, where the train travels at a rate of 50 mph.

4.a The last 2 hours because it appears more steep.

b. I thought it was 5 to 6 hrs, because the line look more steep than the rest.

c.Somewhere around the fifth and sixth hour of the trip would the highest speed be found because the highest rate of change was found in the 5th and 6th hour. Logically you would assume that the highest average or change would have the highest speed.

1)55mph

2)57.6mph

3)The train travels on an average speed of 50mph but then came upon a herd of cows crossing causing the train to stop for 1 an hour after completing five hours of the trip to keep the trip under 11 hours the train must speed up to an average 60mph.

4)

A. FIRST

B. 6-7 hour period

C. 6 becuase there seems to be a

slight increase in the lines

curve at this point

indicating an increase

Do you agree with the answers already posted?

-yes they are similar to mine and seem correct

What questions do you have about HW4?

- Are my answers right?!

What questions do you have about your fellow students' answers?

-None really

What difficulties did you encounter with this homework?

-Number 4 was kind of tricky because I wasnt really sure about my answers but i just went by how the graph looked.

1. 55 mph

2. 57.6 mph

3. 40 mph for 5 hours for a total of 200 miles and 58.3 mph for 6 hours for about 350 miles

4. a. The last two hours

b. From 5-6

c. 5 1/2 hours (the slope is at its peak)

1: 55mph

2: 57.6mph

3: the train sat in the station for 10 hours and 45 minutes, before the conductor hits the warp speed button and the train instantly accelerates to 2200mph and travels the 550 miles in 15 minutes.

4: a) the last two hours

b) hour 5

c) right around hour six, at the end of the sharp increase in speed and right before the decline

Jonathan T. 2nd per.

1. 55 mph

2. 57.6

3. 1st hour: 45 mph for 5.5 hrs.

2nd hour: 55 mph fpr 5.5 hrs.

4a. last 2 hours

4b. between the 4th and 5th hours and also the 5th and 6th hours.

4c. i would choose the middle of the graph around 4.5 hours because that is where the graph begins to have a steeper rise.

1. 55mph

2. About 58mph

3. My train 60mph for the first 2 hours due to less passengers/less stops and then decreases to 40mph for the next 3 hours(rush period), then back to 60mph for the next 3 hours, then 50mph for the next 2 hours, and then back to 40mph during the last 2 hours(rush period).

4a. The last two hours

4b. The 5th hour

4c. The 5th hour

Dolly Sehr

3rd Period

1.55mph

2. 57.6 mph

3. 5.5 hrs at 60 mph(330 mi)

then 5.5 hrs at 40 mph (220)

4.

a. The Last two hours

b. from 5-6

c. 6, thats when the slope looks like it's the steepest.

1. 55 mi/hr

2. 57.65 mi/hr

3. The train traveled 25 mi/hr for the first 5.5 hrs because it was going through busy city streets. After the first 5.5 hrs, the train had made it out of the city and sped up to 75 mi/hr for the last 5.5 hrs.

4a. last 2 hrs (50 mi/hr)

4b. 4-5

4c. Can't be determined, only a range of time can be compared to the miles traveled in that time.

-- Suzanne Guan (1st period)

1. 55mph

2. about 57.65mph

3. The train goes fast at a speed of 60mph for 5 1/2 hours through the country and slows down in the rural area to a speed 40mph for another 5 1/2 hours.

3. a. It is faster during the last two hours.

b. 5-6 hours because the line is steeper.

c. 5-6 hours because the line is steeper.

1.) 55 mph

2.)about 61.2 mph

3.)First two hours, 60 mph, 80 miles

Last two hours, 60 mph, 120 miles

Hours 3-9, 50mph, 350 miles

4.)A. Last two hours

B.)between 5 and 6

C.)5.5 hours, the slope is the steepest at this point

I agree with most of the answers that others posted, they were similar to mine. I had alittle diffciculty with number 4 because I was just basing it off of what i estimated by looking at the graph.

Aaron Steinbrecher 3rd Period

1. 5:00am- 3:00pm= 10hrs

550mi/10hrs= 55mph

2. 5:00am-6:30am= 1.5hrs

40mph for 60mi

6:30am- 3:00pm= 8.5hrs

490mi/8.5hrs= 57.6 mph

3.From 5:00am to 10:30pm, the train travels 220 miles at a speed of 40mph. After realizing it might be late, it speeds up to 60mph for the 330 miles left.

4. a. It was faster during the last two hours because the slope is steeper.

b. Between 5 and 6 hours.

c. 5.5 hours because the increase is largest between 5 and 6 hours.

I do agree with most of the answers posted. I think the most differentiating question was number 2, because some people computed differently than others.

1. 55 mph

2. 61.2 mph

3 The train traveled at 70 mph for280 miles for the first four hours. Then it slowed down a bit for the last six hours, traveling at 270 miles at a speed of 45 mph.

4 a) last two

b) from hours 5-6

c) At 8 hours because the points it's between hour 7, which is the starting to speed up, and hour 9, which is beginning to slow down because it is close to it's destination. So hour 8 is like the peak of the slope.

1. 55mph

2. 57.65

3. the train moves at a constent rate of 55mph for 9 hours until it is comfronted with a hill. the train moves up the hill going 25mph for the first hour then comes back down, going at 80mph, ariving at the station at 3 o'clock

4a. last two hours.

4b. 5 and 6 hours.

4c. 5 and 6 hours because it peaked higher than the other points.

1. 55mph

2. 57.6mph

3. 25mph for 5.5 hours 75mph for 5.5 hours

4. a. last 2 hours

b. hour between 5-6

c. close two hour six because the slope seemed like the steepest.

1. 55 mph

2. 57.65

3. For 5.5 hours it goes at 60 miles, it then goes 40 miles for another 5.5 hours.

4.a.last 2 hours

b.5-6 hours

c.The 5th hour because the graph is steeper.

I agree with most of the answers posted .

[Period 2]

1.) 55 miles/hour

2.)Approx. 57.65 miles/hour

3.)So the train travels at 50m/hr. for the first three hours (150 miles are covered). Then the train travels at 65mph for two hours (280 miles are covered). The last 270m will be covered at 54m/hr....Don't know whether or not I read the question correctly.

4.) a.The train traveled faster in the last two hours (approx. 75mph).

b. Hours 5-6 or 6-7 seem to show the train traveling the fastest.

c. At the 6th hour the graph begins to change instead of a small progression, the train seems to be covering more distance in a smaller amount of time.

laura 3rd period.

1) 55mph

2) ~58mph

3) The train goes 60mph for the first 5 1/2 hours because its early morning. Then slows down to 40 mph for the second half because its, LUNCH TIME!

4a) The last two hours were the fastest.

4b) Between 5 and 6 hours.

4c) 5.5 hours

Michelle Lee

2nd Period

1. about 55 mph

2. 52 mph

3. The first two hours the train travels 50 miles per hour. then travels 42 miles per hour for 5 hours then 60 miles for 4 hours.

4a. the average looks about the same

4b. hour 5-6

4c. at about the 6th hour because the graph looks steepest.

1. 55mph

2. 57.6 or 58mph

3. 60 mph for the first 6 hours and 38 mph for the next 5 hours

4. a. last two hours

b. between 5-6

c. A precise instant would not exist because you need a time period.

**I agreed with most of the people on most of my answers except the last one...so I'm still pondering on it, but I don't see how a precise moment could exist.

1)55 mph

2)57.647 mph

3) I wasn't sure how to do this problem. I was confused.

4)a) the last two hours

b)5 to 6

c) 9.5 hours because when you devide it into 550 it is the fastest compared to the others. I did an approximate mph and the fastest one i got ws 9.5 hours ws the precise time it was going the fastest.

1. 55mph

2. 58mph

3. a) For the first and third fourth of the trip (one fourth = 2h 45min) the train traveled at an avg. of 40 mph and for the second and fourth, fourth of the trip the train went an avg. of 60 mph.

4. a)last 2 hours because it covered more distance in 2 hours than than the first 2. Right??

b) between hr's 5 and 6

c)at around 5 hours. cause the slope is so darn steep.

1. 55 mph

2. 57.67 mph

3. From 5:00 Am to 10:00 a.m. the train went 40 mph, and from 10:00 a.m. to 3:00 p.m. it went 60 mph.

4. a. the last two

b. between the 5th and 6th hour

c. at the 5.5th hour, because its wen the slope was the steepest.

1. 55 mph

2. 57.6471 mph

3. 5.5 hrs at 60 mph(330 mi)

then 5.5 hrs at 40 mph (220)

4a. last 2 hours

b. between hours 5 and 6

c. 6th hour... point highest on curve

1) 55mph

2) 57.65mph

3) For the first 5 hours 45mph and for the next 6 hours 55mph

4a) the last 2 hrs

b) 5-6 hrs

c) about 5.5 hrs because at this time the slope is the steepest.

1) 55 mph

2) 58 mph

3) 40 mph for the first 5.5 hours then 60 mph for the final 5.5 hours

4)a) last 2

4)b) 5-6

4)c) 5.5 it is steepest at that point

#1- 55 mph

#2- 58 mph

#3-

#4- last two hours

- between 4 and 5 hours.

-travel of 100mph

1) 55mph

2) needs to average 57.6mph

3) From 5:00am to 10:00am the train went 40mph, then from 10:00am to 3:00pm it went 60 mph.

4 a) last two hours

b) 5th hour

c) i would pick the point on the graph where the slope is the highest which would be the 6th hour.

1. 55 mph

2. 57.7 mph

3. 60 mph for the first 5 and 1/2 hours. 40 mph for the last 5 and 1/2 hours.

4a. The second half (60 mph) While the first half was a MERE 50 mph

b. 5-6 hours

c. The same answer as above. It is the "steepest" or has a greater slope. This means that the average slope is greater than any other time slot on the graph.

1. 55 mph

2. 57.7 mph

3.

4a. It was the same speed at each end

4b. 4-5

4c.I would say hour 5 because that is right before the train starts to accelerate negatively. Actually I can't tell from this graph.

1. 55 mph

2. 57.65 mph

3. The train goes 60 mph for 5 and a half hours and then goes 40 for another 5 and a half hours.

4. A. The last 2 hours

B. From 5-6

5. I would chose between 5&6 because the slope is the steepest

1. 550 miles/ 10 hrs= 55mph

2. 4 miles * 1.5 hrs= 60 miles

550 miles- 60 miles=490 miles left to go

490 miles/ 8.5 hours=about 58 mph

3.The train traveled 60mph for 6 hours which was a distance of 360 miles. Then it traveled 40mph for 4.75 hours , which was a distance of 190 miles.

4. a.) The last two hours because the 1st hour: 50 m/ 2hr= 25mph while the last two hours: 450 miles/ 9.5 hrs= 47.4 mph

b.)Between 5 and 6 one hour period

c.)5.5 because it has the highest slope and you can tell by the graph also on how steep it is.

1. 55mph

2. The train would have to average about 57.64 to be able to get there on time.

3. The train can travel 60mph for half the time and then slow down to 40mph for the rest of the time.

4. a. The first two hours the train was going traveled about 80mph, the last two hours it traveled about 100mph. If 80 miles is divided by 2 and so is 100, then it shows that the train was traveling faster the last two hours.

b. Judging by the graph the train was going fastest somewhere between the 5th and 6th hour.

1) 55mph

2) 57mph

3) 5 hours :45mph 6 hours :55mph

4a) the last 2 hrs

b) 5-6 hrs

c)betwiin 5-6 hrs because at this time the slope is at the steepest point.

1. 55 MPH

2. 70 MPH

3. 1st 4 hours - 50 MPH

Next hour - 20 MPH

Next hour - 80 MPH

Last 5 hours - 50 mph

4a. last 2 hours.

4b. 6 - 7 hour time frame

4c. it would be between the 6 -7 time frame because the average speed in that time frame was around 100 MPH.

Evan Gratteau

1. 55mi/hr

2. about 58mi/hr

3. would go 40mi/hr then speed up to 60mi/hr because it was going downhill.

4a.the last two hours

b.5-6 hours

c. 5.5 approximatly.

1. 55 m/h

2. 57.6 m/h

3. 75m/h then 25m/h

4.

a. last two

b. 5-6 hours

c. 5:30 pm

1. 55mph

2. 58

3.The train travels 40 mph for the fisrt 5.5 hours. Then, at 10:30 am it gets in gear and travels 60 mph for the remaining 5.5 hours.

4.a) the last 2 hours

b) between the 5th and 6th hour

c) around the 6th hour because the slope increases

Post a Comment