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Conservation of Momentum problem

  • Thread starter Sheneron
  • Start date
360
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[SOLVED] Conservation of Momentum problem

1. 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?

3. 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.
 

Answers and Replies

Doc Al
Mentor
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Find the change in kinetic energy.
 
360
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Ok thanks for the help. Makes sense.
 

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