Answer
Please see the work below.
Work Step by Step
We know that
$U=\frac{1}{2}Kx^2$
This simplifies to:
$U=\sqrt{\frac{2U}{K}}$
We plug in the known values to obtain:
$U=\sqrt{\frac{2(210)}{1400}}=0.55m$
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: 15
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