Answer
$10$N
Work Step by Step
$F = -(\frac{\Delta U}{\Delta x})$
$=-(\frac{U_A - U_B}{x_2-x_1})$
$=-(\frac{15J - 35J}{4m-2m})$
$=-(\frac{-20J}{2m})$
$=-(-10$N$)$
$=10$N
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 8 - Potential Energy and Conservation of Energy - Problems - Page 205: 39b
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