Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Explain: 90

Answer

Yes. Zero momentum for a single object (which has mass), mv, means its speed is zero. The KE, $\frac{1}{2}mv^{2}$, must also be zero. Note that a system of two or more objects can have zero net momentum, but nonzero KE. For example, consider two identical balls rolling at the same speed, about to have a head-on collision.
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