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A pitcher throws a ball at 90 mi /h and the catcher stops
Chapter 7, Problem 18P(choose chapter or problem)
Problem 18P
A pitcher throws a ball at 90 mi /h and the catcher stops it in her glove. (a) Is the work done on the ball by the pitcher positive, negative, or zero? Explain. (b) Is the work done on the ball by the catcher positive, negative, or zero? Explain.
Questions & Answers
QUESTION:
Problem 18P
A pitcher throws a ball at 90 mi /h and the catcher stops it in her glove. (a) Is the work done on the ball by the pitcher positive, negative, or zero? Explain. (b) Is the work done on the ball by the catcher positive, negative, or zero? Explain.
ANSWER:
a.)
Step 1 of 2
We have to explain is the work done on the ball by the pitcher is positive, negative, or zero, if a pitcher throws a ball at 90 mi /h and the catcher stops it in her glove.
By WorkEnergy theorem the total work done on an object is equal to change in its kinetic energy.
Now, for work done on the ball by the pitcher as the ball gains kinetic energy from the action of pitcher.
Hence, the work done is positive.
Therefore, the work done on the ball by the pitcher is positive.
b.)