Answer
$-21 J$
Work Step by Step
Recall the following equation:
$W=F (cos(\theta)) \cdot d$
In the picture above, we plug in the known values to obtain the answer. (Recall, in part a, we solve for $F_a$.)
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 7 - Kinetic Energy and Work - Problems - Page 175: 59b
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