Halliday, Resnick & Walker — Center of Mass and Linear Momentum: Problem 22

22 Figure 9-39 gives an overhead view of the path taken by a 0.150 kg cue ball as it bounces from a rail of a pool table. The ball's initial speed is 2.00 m/s, and the angle \(\theta_1\) is 30.0°. The bounce reverses the y component of the ball's velocity but does not alter the x component. What are (a) angle \(\theta_2\) and (b) the change in the ball's linear momentum in unit-vector notation? (The fact that the ball rolls is irrelevant to the problem.)