Answer
The ball, initially at rest, tends to remain at rest. From the viewpoint of an observer nearby, it stays in place as the wagon, which feels a pulling force, moves forward underneath it.
Work Step by Step
This is discussed on page 26.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 2 - Think and Discuss - Page 38: 81
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