Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 9 - Section 9.2 - Momentum - Got It? - Page 159: 9.3


d) only

Work Step by Step

The only momentum that remains constant is the momentum of both skaters and the ball in a system. After all, as the ball is tossed around, the momentum is transferred between each of the skaters and the ball. Therefore, only a system containing all three of these things will have constant momentum.
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