Answer
$x = 4.5~m$
Work Step by Step
In part (d), we found that the total work done on the case is zero when $x = 4.5~m$
Since the case started at rest, the case will be at rest at $~~x = 4.5~m$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 7 - Kinetic Energy and Work - Problems - Page 176: 78e
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