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April 20, 2014

Homework Help: physics

Posted by jj on Wednesday, September 28, 2011 at 9:55pm.

A 1200 kg car on a horizontal surface starts from rest and accelerates uniformly to 72 km/h in 20.0 s. Friction exets an average force of 450 N on the car during this time.

a) what is the net work done on the car
b) how far does the car move during this acceleration


now i knoq W=fxd but how else could i get it!!!! and how does the friction work in?

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