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In which of the following systems is the total mechanical energy conserved? O A) A rock is falling down from a height above the ground

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In which of the following systems is the total mechanical energy conserved? O A) A rock is falling down from a height above the ground with negligible air resistance O B) A book sliding along an inclined plane with a constant speed. C) A train moving parallel to the ground and coming to a stop. OD) A smoothly oscillating pendulum whose amplitude is damping

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