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:
$U=(70)(9.8)(1900-0.0)=1.3MJ$
(b) $U=mg\Delta y$
We plug in the known values to obtain:
$U=(70)(9.8)(0.0-86)=-59KJ$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 7 - Exercises and Problems - Page 125: 13
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