Explanation Given info: The mass of the baseball is 0.150 kg , the speed of the baseball is 40.0 m / s and the initial angle to the horizontal is 30.0 ° . The angle of projection of baseball is shown in Figure below, Figure (1) The expression for the kinetic energy of the baseball is, K = 1 2 m v x 2 (1) Here, m is the mass of the baseball. v x is the horizontal component of velocity of the baseball. The ball reaches the maximum height at the point A , it has only horizontal component of velocity and after the maximum point of the trajectory the speed of ball is constant through its horizontal component so there is no acceleration in the horizontal direction. The horizontal component of velocity of baseball at the maximum point of trajectory is, v x = v cos 30 ° Substitute 40.0 m / s for v in the above equation. v x = ( 40

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN: 9781305116399

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Chapter 7, Problem 7.55AP

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The kinetic energy of the baseball at the height point of its trajectory.

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Physics for Scientists and Engineers, Technology Update (No access codes included)

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