HOw do I do these two problems. I know it has something to do with angles the ball trike each other, but I am so Lost. Problem 1. Ball A, rolling west at 3.0m/s, has a mass of 2.0 kg. Ball B is 2.0 kg,and is stationary. After colliding with ball b, ball a moves south at 2 m/s. calculate the momentum and velocity of ball B after the collision. Problem 2. A cue ball, moving with 7.0 Ns of momentum strikes the nine ball at rest. The nine ball moves off with 2.0Ms in the original direction of the cue ball and 2.0Ns perpendicual to that direction. What is the momentum of the cue ball after the collision. I have no idea what to do with these.