Answer
The man's own weight is the upper limit.
Work Step by Step
If the box's weight is greater than the man's weight, his feet leave the ground.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 2 - Think and Explain - Page 36-38: 65
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