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I worked out that large (80,000 lb) truck has roughly 4 to 5 times the
braking surface area as a car - discussion with several of my students who
do repairs gave me the info. The truck needs to transfer 20 to 40 times more
KE than a car in stopping. Graphing some data from the web yields that truck
to car stopping distances are 1.8 on average.
This does not seem to add up. It would seem like a truck must have about 10
times the braking surface of a car to stop in 1.8 times the distance.
Where am I wrong?