Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 2 - Describing Motion: Kinematics in One Dimension - Questions - Page 41: 10


The ball’s speed is 120 km/hr when it returns, and the velocity is directed downward.

Work Step by Step

This is explained in Example 2-15. With no air resistance, it takes the same time for the ball’s velocity to change from 120 km/h to 0 (on the way up) as it does for its velocity to change from 0 to -120 km/h (on the way down).
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