Fundamentals of Physics Extended (10th Edition)

Published by Wiley

Chapter 7 - Kinetic Energy and Work - Problems: 15b

Answer

Kinetic energy increases

Work Step by Step

Since net force $=5+(-9cos60^{\circ})=0.5N$, there is some net positive acceleration and that means velocity is increasing at a constant rate. Furthermore, since the expression of Kinetic Energy is $\frac{1}{2}mv^{2}$, an increase in velocity results in an increase in kinetic energy.

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.