Conceptual Physics (12th Edition)

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

Chapter 2 - Think and Explain - Page 36-38: 65

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.
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