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

question 42

Multiple Choice

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.

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Definitions:

Musculocutaneous

Relating to both muscles and the skin, or a nerve in the arm that innervates the front muscles of the upper arm and the skin of the forearm.

Radial

Pertaining to structures spreading out in all directions from a central point or axis.

Ulnar

Pertaining to the ulna, one of the two long bones in the forearm, located on the side opposite the thumb.

Ulnar

Pertaining to the ulna, one of the two long bones in the forearm, located on the side opposite to the thumb.