Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 8 - Potential Energy and Conservation of Energy - Questions: 3b

Answer

The $\Delta$$E_{mec}$ due to $F_{nc}$ is -2J.

Work Step by Step

The second path from the top has a $\Delta$$E_{mec}$ of 10J. All the other paths have a $\Delta$$E_{mec}$ of 12J. For this reason, that second path must be the one with non-conservative forces. These forces account for the loss of 2J.
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