1. A 0.82 kg tennis ball strikes a wall moving at 10 m/s to the right. The tennis ball rebounds to the left at the same speed. Calculate the ball’s change in momentum. (Answer: -16 kgm/s)

2. A baseball player swings and hits a 0.15 kg ball with a 2.0 kg bat. The ball is initially traveling at 38 m/s to the left. It feels a force of 43 N directed to the right, which lasts for 0.21 s.

a) Find the net impulse delivered to the ball. (Ans: +9.0 Ns)
b) Find the ball’s final velocity. (Answer: +22 m/s)