The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration of -5.50 m/s2 for 4.35 s, making straight skid marks 63.0 m long, all the way to the tree. With what speed does the car then strike the tree?
The car decelerates by
V = -5.50[m/s²]*4.35[s] = -23.925 m/s.
Let's find the initial speed V0 of a car. We know that