Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Explain: 83

Answer

The coin is in free fall, so the only force acting on it is its weight, mg. This is true at all points in its path. This is discussed on pages 64-65.
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