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A 140g ball, in horizontal flight with a...

A 140g ball, in horizontal flight with a speed `v_(1)` of 39.0 m/s. is sturck by a bat. After leaving the bat, the ball travel in the opposite direction with speed `v_(2)=39.0 m//s`. If the impact time `Deltat` for the ball-bat collision is 1.20ms, what average net force acts on the ball

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