Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 90

Answer

10 J.

Work Step by Step

When released, the 10 J of potential energy (stored in the system by the work you performed on the electric charge) transforms into 10 J of kinetic energy just as it returns to its starting position. This situation is analogous to expending 10 J of work to raise a mass to a position where it has 10 J of gravitational PE. When released, it falls back to where it started, and has 10 J of KE.
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