Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 2 - Kinematics in One Dimension - Exercises and Problems: 67

Answer

Nicole threw the ball with a speed of 14 m/s

Work Step by Step

Since the ball passes Chad with a speed of 10 m/s on the way down, the ball had a speed of 10 m/s when it passed Chad on the way up. We can find the initial speed of the ball as; $v_0^2 = v^2-2ay$ $v_0 = \sqrt{v^2-2ay}$ $v_0 = \sqrt{(10~m/s)^2-(2)(-9.8~m/s^2)(5.0~m)}$ $v_0=14~m/s$ Nicole threw the ball with a speed of 14 m/s.
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