physics
posted by anton .
4.80kg watermelon is dropped (zero initial speed) from the roof of a 25.0mtall building. a) Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. b) What is the kinetic energy of the watermelon just before it strikes the ground? You can ignore air resistance.
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Okay. How do I go about answering this question? 
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