posted by jj .
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?