A baseball pitcher sends a fastball toward the batter with a speed of 40 m/s. The batter swings and misses, and the catcher brings the ball to rest by applying a constant force to it over a distance of 8.0 cm. Assume for simplicity that the ball (whose mass is 145 g) is traveling perfectly horizontally during the entire catch. Use the work-energy principle to determine the force that the catcher exerts on the ball. Determine how much time it took for the catcher to bring the ball to rest. Does the catcher do positive work or negative work on the ball while catching it? Explain your reasoning. Suppose that the catcher now throws the ball back to the pitcher. Do they do positive work or negative work on the ball while throwing it? Explain your reasoning.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter7: Conservation Of Energy
Section: Chapter Questions
Problem 21P: A 5.00-kg block is set into motion up an inclined plane with an initial speed of i = 8.00 m/s (Fig....
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A baseball pitcher sends a fastball toward the batter with a speed of 40 m/s. The batter swings
and misses, and the catcher brings the ball to rest by applying a constant force to it over
a distance of 8.0 cm. Assume for simplicity that the ball (whose mass is 145 g) is traveling
perfectly horizontally during the entire catch.
Use the work-energy principle to determine the force that the catcher exerts on the ball.
Determine how much time it took for the catcher to bring the ball to rest.
Does the catcher do positive work or negative work on the ball while catching it? Explain
your reasoning.
Suppose that the catcher now throws the ball back to the pitcher. Do they do positive
work or negative work on the ball while throwing it? Explain your reasoning.
Transcribed Image Text:A baseball pitcher sends a fastball toward the batter with a speed of 40 m/s. The batter swings and misses, and the catcher brings the ball to rest by applying a constant force to it over a distance of 8.0 cm. Assume for simplicity that the ball (whose mass is 145 g) is traveling perfectly horizontally during the entire catch. Use the work-energy principle to determine the force that the catcher exerts on the ball. Determine how much time it took for the catcher to bring the ball to rest. Does the catcher do positive work or negative work on the ball while catching it? Explain your reasoning. Suppose that the catcher now throws the ball back to the pitcher. Do they do positive work or negative work on the ball while throwing it? Explain your reasoning.
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