Answer
Please see the work below.
Work Step by Step
We know that
$U=mg\Delta y$
We plug in the known values to obtain:
$-240000=(60)(9.8)(h-1250)$
This simplifies to:
$h=840m$
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: 15
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