Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 9 - Section 9.6 - Elastic Collisions - Got It?: 9.7

Answer

The ball on the floor at rest is not as massive as the other ball.

Work Step by Step

If the ball at rest was more massive, it would end up going in the original direction of the other ball, and the other ball would bounce off and go in the opposite direction. However, since they end up going in the same direction, we see that the ball initially moving was more massive.
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