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 4 - Kinematics in Two Dimensions - Exercises and Problems: 17

Answer

His pitching speed is 27.7 m/s

Work Step by Step

We can find the flight time of the ball; $y = \frac{1}{2}gt^2$ $t = \sqrt{\frac{2y}{g}}$ $t = \sqrt{\frac{(2)(4.0~m)}{9.80~m/s^2}}$ $t = 0.904~s$ We can find the ball's initial speed; $v_x = \frac{x}{t} = \frac{25~m}{0.904~s}$ $v_x = 27.7~m/s$ His pitching speed is 27.7 m/s
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