A batter hits a baseball with mass 0.145 kg straight upward with an initial speed of 25.0

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A batter hits a baseball with mass 0.145 kg straight upward with an initial speed of 25.0 m/s.
(a) How much work has gravity done on the baseball when it reaches a height of 20.0 m above the bat?
(b) Use the work-energy theorem to calculate the speed of the baseball at a height of 20.0 m above the bat. You can ignore air resistance.
(c) Does the answer to pan (b) depend on whether the baseball is moving upward or downward at a height of 20.0 m? Explain.
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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