College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 3 - Multiple-Choice Questions - Page 110: 28

Answer

The sign of $\sum F_x$ is $~-~$

Work Step by Step

The sign of $v_x$ is $~+~$ but the speed is decreasing. Therefore, the acceleration must be in the $~-x~$ direction. Then the net force must also be in the $~-x~$ direction. The sign of $\sum F_x$ is $~-~$
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