Answer
(b) in the backward direction.
Work Step by Step
Due to inertia, the block slides forward. Therefore, the frictional force which is always opposite to the direction of motion would be in the backward direction.
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 4 - Force and Motion - Learning Path Questions and Exercises - Multiple Choice Questions - Page 132: 16
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