Answer
(b)
Work Step by Step
Since the formula is $W=Fd\cos\theta$, work will be positive when force is positive and work will be negative when force will be negative. Therefore, the answer is (b).
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 5 - Work and Energy - Learning Path Questions and Exercises - Multiple Choice Questions - Page 172: 3
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