A car leaves skid marks 72m in length. The deceleration is 7.2m/s^2. What is the speed of the car before braking?

Answer 1

V^2 = Vo^2 + 2a*d = 0
Vo^2 = -2a*d = -2*(-7.2)*72 = 1036.8
Vo = 32.2 m/s. = Speed before braking.