Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 4 - Kinematics in Two Dimensions - Conceptual Questions: 8

Answer

Ball 1 was thrown with a faster speed.

Work Step by Step

Anita is running to the right at a speed of 5 m/s. Since Anita says that ball 1 is approaching her at 10 m/s, ball 1 must be moving at a speed of 15 m/s with respect to the ground. Since Anita says that ball 2 is approaching her at 10 m/s, ball 2 must be moving at a speed of 5 m/s with respect to the ground. Therefore, ball 1 was thrown with a faster speed.
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