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1. The problem statement, all variables and given/known data

A 145 g baseball is dropped from a tree 8.0 m above the ground.

(b) If it actually hits the ground with a speed of 7.80 m/s, what is the magnitude of the average force of air resistance exerted on it?

2. Relevant equations

I've tried this problem several times, but I do not know how to find air resistance using the energy of the problem. Any help would be appreciated!

(air resistance) h= (delta)KE +(delta)PE

3. The attempt at a solution

(air resistance)=(m(.5(v^2)-gh))/h

Using this I got 5.56 N as an answer, but apparently that's wrong.

Any help whatsoever is appreciated!

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# Homework Help: Frictional Energy?

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