## Fundamentals of Physics Extended (10th Edition)

Published by Wiley

# Chapter 8 - Potential Energy and Conservation of Energy - Problems: 39c

#### Answer

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.

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.