Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 6 - Think and Rank: 42


C, A, B.

Work Step by Step

Momentum is conserved in these collisions. Calculate the total momentum before the collision, which equals the momentum afterward. The larger the final momentum, the larger the speed. The momentum in each situation is calculated here: $$(5M)(4 m/s) + 0 = 20M \frac{kg \cdot m}{s}$$ $$(5M)(4 m/s) + (M)(-1 m/s)= 19M \frac{kg \cdot m}{s}$$ $$(5M)(5 m/s) + (M)(-2 m/s)= 23M \frac{kg \cdot m}{s}$$
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