Conceptual Physics (12th Edition)

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

Chapter 3 - Think and Discuss: 81

Answer

When direction doesn't change, acceleration may be expressed as the rate at which speed changes. Therefore, in straight-line motion, when the speedometer reading changes, acceleration is taking place. If there is no change, there is no acceleration.

Work Step by Step

This is discussed on page 45.
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