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How is the potential energy effected as a ball lying on top of a 20 m tall building rolls down to the next

building which is 10 m tall

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Answer:

Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational potential energy.

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