While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue balls velocity was 10 m/s and the 8 ball was at rest. If both balls have a mass of 0.15 kg and the cue balls velocity after the collision is 2 m/s in the same direction as before, what is the 8 balls velocity?

PHYSICS

Please wait while the activity loads.
If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If loading fails, click here to try again

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball’s velocity was 10 m/s and the 8 ball was at rest. If both ball’s have a mass of 0.15 kg and the cue ball’s velocity after the collision is 2 m/s in the same direction as before, what is the 8 ball’s velocity?

A	2 m/s
B	8 m/s
C	-2 m/s
D	1.5 m/s

Explanation:

Detailed explanation-1: -The momentum of the 8 ball is zero because it is not moving yet. If you hit it straight on and the cue ball stops at the collision, then all of momentum of the cue ball must go into the 8 ball because momentum is conserved. If you hit it at an angle, both balls keep moving after the collision.

Detailed explanation-2: -No matter what type of collision you have, momentum will be conserved. This means that the total momentum of all of the colliding objects before the collision will be the same as the total momentum afterwards.

There is 1 question to complete.

SSC MTS EXAM

SSC

PHYSICS