Answer
Please see the work below.
Work Step by Step
We know that
(a) $U=mg\Delta y$
We plug in the known values to obtain:
$U=(65)(9.8)(11000-0.0)=7.0MJ$
(b) $U=mg\Delta y$
We plug in the known values to obtain:
$U=(70)(9.8)(1600-0.0)=1.1MJ$
Essential University Physics: Volume 1 (4th Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0-134-98855-8
ISBN 13:
978-0-13498-855-9
Chapter 7 - Exercises and Problems - Page 130: 13
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