Answer
During the jump, when the cable is slack, the only force acting on the jumper is gravity. The jumper feels weightless because s/he is in fee fall and there is no support force.
Work Step by Step
This is discussed on page 166.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 9 - Think and Explain - Page 179-180: 68
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