Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Discuss: 104

Answer

The moon has no atmosphere, so there is no drag force. The rock is in free fall, and the only force acting on it is its weight (the moon pulling down on it).
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