Conservation of Momentum problem

AI Thread Summary
The discussion revolves around a conservation of momentum problem involving a tennis player returning a shot. The player receives a ball weighing 0.0600 kg traveling at 54.0 m/s and returns it at 34.0 m/s in the opposite direction. The impulse delivered to the ball was calculated as 5.28 kg·m/s based on the change in momentum. For the work done by the racquet, the initial approach using kinetic energy was incorrect, leading to a suggestion to calculate the change in kinetic energy instead. The conversation emphasizes understanding impulse and kinetic energy in the context of momentum conservation.
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[SOLVED] Conservation of Momentum problem

Homework Statement



A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 54.0 m/s and returns the shot with the ball traveling horizontally at 34.0 m/s in the opposite direction. (Assume the initial direction of the ball is in the -x direction.)

(a) What is the impulse delivered to the ball by the racquet?

(b) What work does the racquet do on the ball?

The Attempt at a Solution


I got part A by finding the change in initial and final momentum of the ball (5.28).

I thought I could get part B by: mv = 5.28 so v = 88 m/s; and plug that into .5mv^2 to find the energy. That was wrong though and now I am not sure how to solve it.
 
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Find the change in kinetic energy.
 
Ok thanks for the help. Makes sense.
 

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