Conceptual Physics (12th Edition)

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

Chapter 3 - Think and Discuss: 87

Answer

Yes. A vertically thrown projectile on its way up has an acceleration that is directed straight down. This is discussed on pages 46-47. More generally, an object's acceleration is opposite to its velocity when it is moving in a straight line and slowing down. For example, a car coming to a stop at a red light has an acceleration that is opposite to its velocity.
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