A car of mass 1335.0 kg is moving at a speed of 60.4 mph when it misses a curve in the road and hits a bridge piling. If the car comes to rest in 0.214 s, how much average power (in watts) is expended in this interval?
power=energy/time=kechange/time= 1/2 m (v^2/.214)
convert v to m/s first.