A 425-kg watermelon is dropped fromrest from the roof of a, Physics

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A 425-kg watermelon is dropped fromrest from the roof of a

A 4.25-kg watermelon is dropped fromrest from the roof of a 20.5-m-tallbuilding and feels no appreciable air resistance.

a) Calculate the work done by gravity on thewatermelon during its displacement from the roof to the ground.
b) Just before it strikes the ground find the watermelon's kineticenergy?

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