| A billiard ball hits the side of a pool table at an angle \[\theta \] as shown in the top view above, and bounces away at the same angle, and with the same speed. Which vector indicates the direction of the net change in momentum of the billiard ball? |
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A)
B)
C)
D)
Correct Answer: D
Solution :
| The billiard ball has velocity vectors in both the x and y directions, as shown here. The x-component of the velocity remains unchanged, but the y-component has changed from the positive to the negative direction, a change in velocity - and thus, momentum- in the negative y direction. |
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