Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 3 - Think and Rank: 42

Answer

C, B=D, A.

Work Step by Step

The ball is moving fastest at point C because it has dropped the farthest from its starting point. The ball is moving equally fast at points B and D because the ball has dropped an equal amount from the starting point. (We ignore friction, which would make the ball slightly slower at D than at B). The ball is moving most slowly at point A where it has dropped just a small distance from its starting point.
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