Answer
$W = -392~J$
Work Step by Step
We can find the work done by gravity as;
$W = F\cdot d$
$W = F_x~d_x+F_y~d_y$
$W = (0)(r_{2x}-r_{1x})+(-mg)(r_{2y}-r_{1y})$
$W = 0-(25~kg)(9.80~m/s^2)(2.9~m-1.3~m)$
$W = -392~J$
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0133942651
ISBN 13:
978-0-13394-265-1
Chapter 9 - Work and Kinetic Energy - Exercises and Problems - Page 228: 16
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