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A 120 gm ball moving at 18 m//s strikes ...

`A 120 gm` ball moving at `18 m//s` strikes a wall perpendicularly and rebounds straight back at `12 m//s.` After the initial contact, the center of the ball moves 0.27 cm closer to the wall. Assuming uniform deceleration, show that the time of contact is 0.00075 seconds. How large an average force does the ball exert on the wall ?

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