Answer
Force $F_{32}$ is accelerating only 10kg to the right.
Work Step by Step
The normal force off of block 2 on to block 3 is only accelerating block 3 to the right. Therefore the total mass accelerated is the mass of block 3 alone (10kg).
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 5 - Force and Motion-I - Questions - Page 116: 10c
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