Two air-hockey pucks experience a one-dimensional elastic collision on a frictionless air-hockey table. Before the collision, puck A is moving at a velocity of v to the right, while puck B has a velocity of 4v to the left. Puck B's mass is two times puck A's mass. In this problem, let's define left as the positive direction, and you can use v = 1.20 m/s.
(a) Determine puck A's velocity after the collision. Use a positive sign if it is directed left, and a negative sign if it is directed right.

(b) Determine puck B's velocity after the collision. Use a positive sign if it is directed left, and a negative sign if it is directed right.