A pitcher throws a 0.15-kg baseball so that it crosses home plate horizontally with a speed of 20 m/s. The ball is hit straight back at the pitcher with a final speed of 22 m/s.
(a) What is the impulse delivered to the ball?
(b) Find the average force exerted by the bat on the ball if the two are in contact for 2.0 × 10-3 s. Choose the positive direction to be from the pitcher toward home plate.