Conceptual Physics (12th Edition)

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

Chapter 10 - Think and Solve: 32

Answer

3 billion joules. Yes, the PE decreases by 3 billion J.

Work Step by Step

The work-energy theorem says that the net work done is the change in kinetic energy. The KE change is 8 GJ - 5 GJ = 3 billion J. The sum of KE and PE remains the same. KE increased, so potential energy decreased by the same amount, 3 billion J.
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