A billiard ball moving at 0.5 m/s strikes another identical billiard ball, which is at rest, in an elastic head-on collision on a level table. Which of the following statements best describes the billiard balls after the collision?     A.The moving ball continues to move at a 0.2 m/s in its original direction and the other ball moves at 0.4 m/s in the same direction.   B.The moving ball rebounds directly back at 0.5 m/s and the other ball remains at rest.   C.The moving ball stops and the other ball moves off at 0.5 m/s in the original direction of the moving ball. D.The balls both move off together in the same direction at 0.25 m/s.

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