An air hockey puck (m = 0.20 kg) is traveling 4.0 m/s when it hits a stationary puck that has the same mass. a. What is the initial momentum of the first puck?

b. What is the total momentum of the system before the collision?

c. What is the total momentum of the system after the collision?

d. If the first puck stops, what is the final momentum of the second puck?

e. What is the final velocity of the second puck?