Answer
C, B, A.
Work Step by Step
The boxes are in equilibrium, so the frictional force equals the horizontal push force.
This is discussed on pages 59-60.
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 Rank - Page 70: 55
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