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During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s...

During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s toward the wall to 12.0 m/s away from the wall. If the time the ball was in contact with the wall was 0.04 s A.) What is the magnitude of the change of momentum of the ball? B.) What is the magnitude of the average force exerted on the ball?

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