Fundamentals of Physics Extended (10th Edition)

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: 39c


F acts in positive $x$ direction

Work Step by Step

Work done by the force is is equal to negative change in potential Energy : $W=-\Delta U=-\left( U_{B}-U_{A}\right) =-20J=F\times \Delta x=F\times \left( 2-4\right) =F\times \left( -2\right) \Rightarrow$ This leads to: $ F=10N$ We see that $F$ is positive so it acts in positive $x$ direction.
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