Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 6 - Exercises and Problems: 56

Answer

Please see the work below.

Work Step by Step

We consider the lower point of swing at ground position; the work will be done against gravity with respect to ground position. $Work \space done=mgh$ As $\Delta h=L_Lcos{\phi}$ $\implies Work\space done=mgL(1-cos{\phi})$
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