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After being thrown downward from the roof of a building, a ball of mass 1/3 kg strikes the ground at a speed of 60 m/s.

After being thrown downward from the roof of a building, a ball of mass 1/3 kg strikes the ground at a speed of 60 m/s. Just after the ball hit the ground, the velocity of the ball is 30 m/s, upward. If the ball was in contact with the ground for 1/20 s, what was the magnitude of the average force exerted on the ball by the ground

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