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A 0.7kg tennis ball is dropped from rest at a height of 5m onto a hard floor.

--From that, I was able to determine that the final velocity is 9.9m/s.

The part I'm having trouble with is this: A flash photograph shows that the ball is compressed a maximum of 0.6cm when it strikes the floor. Assuming that the acceleration of the ball is constant during its contact with the floor, what force does the floor exert on the ball?

I really don't know what to do with this information...

Any help would be greatly appreciated!