Answer
2100 J.
Work Step by Step
Find the change in gravitational PE.
$$\Delta PE = mgy_f-mgy_i=mg(y_f-y_i) = (54 kg)(9.8 \frac{m}{s^2})(4.0 m)=2100 J$$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 6 - Work and Energy - Problems - Page 165: 26
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