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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 4 - Think and Explain - Page 71-72: 83
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