A crane drops a 1.0-kg steel ball onto a

steel plate. The ball's speed

just before impact is 2.0 m/s. If the

average impact force is 300 N, and the ball is in contact with the plate for 0.01 second, what is the

bounce back speed right after the impact?

a. 1.0 m/s

b. 2.0 m/s

c. 3.0 m/s

d. 4.0 m/s

e. 5.0 m/s