Conceptual Physics (12th Edition)

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

Chapter 3 - Think and Explain: 66

Answer

With negligible air resistance, both balls will strike the ground at the same speed.

Work Step by Step

This is discussed on pages 46-47. With no air resistance, the ball thrown straight upward will eventually pass through its starting point with the same initial speed, but now directed downward. After that it will behave the same as the ball thrown straight downward, and hit the ground at the same speed.
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