A student plots data for the velocity of a body versus the time on a graph. The area under the curve on the graph may be identified as
A. average velocity.
B. distance.
C. average speed.
D. acceleration.
Answer: B
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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, but only at the instant that they collide. E) Yes, if they are both moving outward from the same point.