Can two pool balls, both of them moving, have a total momentum of zero?
A) No, because any moving object has momentum.
B) No, because they both have energy.
C) Yes, if they are moving in opposite directions, both with the same speed.
D) Yes, if they are both moving outward from the same point.
E) Yes, but only at the instant that they collide.

Question

Quizplus · Accepted Answer

If two pool balls are moving in opposite directions with the same speed and have equal mass, their momenta are equal in magnitude but opposite in direction, resulting in a total momentum of zero.

Can Two Pool Balls, Both of Them Moving, Have a Total