Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Explain - Page 129-130: 63



Work Step by Step

In calculating speed, one must specify the frame of reference (as discussed on page 40). For example, an apple on a jet plane may appear to have zero kinetic energy from the viewpoint of a passenger, but a very high kinetic energy from the viewpoint of someone on the ground.
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