Yamkela mangala

The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with an acceleration of -5.60 m/s^2 for 4.20 s, making mark straight skid marks of 62.4 m long ending at the tree. With what speed does the car then str...

Vf^2 = Vi +2ad Data Vi=20.0 m/s Vf=0m/s ( at rest) dx=100m a=? Force? (O)^2=(20)^2 +2a(100) -400=200a a=-2m/s^2 Force=ma := -2(800) = -1600N