A 95-kg football player traveling 5.0 m/s is stopped in 1.0 s by a tackler. a. What is the original kinetic energy of the player? b. What average power is required to stop him? a. K=(1/2)mv2 K=(1/2)(9500 g)(5.0 m/s)2= 118,750 J b. P=w/t P=118750 J/1.0 s= 118750 W Would this be correct because of the work-energy principle?