Question

A car of mass 1298.7 kg is moving at a speed of 64.0 mph when it misses a curve in the road and hits a bridge piling. If the car comes to rest in 0.234 s, how much average power (in watts) is expended in this interval?

Answer 1

energy=1/2 m v^2
energy/time=power=1/2 m v^2/time