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Mechanical energy is defined as the sum of both the potential energy and the kinetic energy of an object. According to the law of conservation of energy, what happens to mechanical energy if the potential energy of an object decreases? A: Mechanical energy decreases B: Mechanical energy increases C: Mechanical energy increases and then decreases D: Mechanical energy remains unchanged.

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i think the answer is B, i may be wrong... because potential energy is stored energy and kinetic energy is energy due to motion so the less potential energy the more kinetic energy

and mechanical energy means the energy of motion, such as a moving vechile which is using kinetic energy.

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