Answer
The first is B.
Work Step by Step
$v_{1} = \frac{(m_{1}+m_{2})v+m_{2}v_{2}}{m_{1}} $
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 9 - Center of Mass and Linear Momentum - Questions - Page 245: 3a
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