Answer
The rock's mass is 1 kg.
Work Step by Step
This problem is the same as Check Point #2 on page 142, but in reverse.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 8 - Think and Solve - Page 155: 46
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