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).
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 Discuss - Page 73: 104
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