Conceptual Physics (12th Edition)

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

Chapter 6 - Think and Explain: 72

Answer

A system is a collection of objects. When we calculate the total momentum of all the objects in the system, that remains constant (i.e., it is conserved) as long as there is no net external force.
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