Conceptual Physics (12th Edition)

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

Chapter 6 - Think and Explain: 65

Answer

The swarm can have a net momentum of zero if the center of the swarm doesn't move anywhere (in the average sense). If the swarm's average velocity is zero, the momentum vectors of the insects cancel, and sum to zero.
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