University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 7 - Potential Energy and Energy Conservation - Problems - Discussion Questions - Page 228: Q7.7

Answer

She is the source of the extra mechanical energy. Mechanical energy is not conserved because the chemical energy in her body is being transformed into mechanical energy.

Work Step by Step

She pushes off against the trampoline as she rises, causing an additional reaction force upward on her, which does positive work and launches her upward faster than if she didn’t exert her leg muscles.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.