# Collisions

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Question: A tennis player returns a 30 m/s serve back at 25 m/s after making contact with the ball for .5 seconds.

If the ball has a mass of 0.2 kg, what is the force she exerted on the ball?

https://brainmass.com/physics/velocity/collisions-contact-forces-15146

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Solution:

Denote the force she exerted on the ball by F. Denote the mass of a ball by m. So m=0.2 kg. We can set up ...

#### Solution Summary

This solution provides both the equation required to complete the calculation pertaining to this physics question, and an explanation of what variables are used. This solution should provide a concrete understanding of how to approach this question and is all completed in under 100 words.

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