posted by larry on .
A girl of mass 60 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall
horizontally with a speed of 11 m/s, and it bounces back with this same speed. The ball is in contact
with the wall 0.05 s. What is the average force exerted on the wall by the ball?
A) 6600 N B) 26,400 N C) 13,200 N D) 180 N E) 350 N