Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 10 - Interactions and Potential Energy - Conceptual Questions - Page 255: 12


$W_{ext} = 0$ $U_{Gf} = 0$ $K_f = 2~J$

Work Step by Step

Since there is no force acting on the firefighter except for the gravitational force and the frictional force which is accounted for in $\Delta E_{th}$, then $W_{ext} = 0$ Since the firefighter is on the ground at the end, $U_{Gf} = 0$ Since energy must be conserved, $K_f = 2~J$
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