Can you compare and contrast "average speed" and "instantaneous speed"?
These sites might help...
http://mathworld.wolfram.com/SecantLine.html
http://en.wikipedia.org/wiki/Image:Derivative.png
http://www.ies.co.jp/math/java/calc/limsec/limsec.html
http://www.math.umn.edu/~garrett/qy/Secant.html
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/mmedia/kinema/trip.html
http://library.thinkquest.org/C0110840/instant.htm
Questions, comments?
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