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Write law of conservation of mechanical ...

Write law of conservation of mechanical energy. Write an example.

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`to` For motion under an external conservative force the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant.
`to` The example is the free fall of an object under gravity. Both the kinetic energy of the object and its potential energy change continuously with time, but the sum remains fixed.
`to` If the object is released from rest the initial potential energy is completely converted into the kinetic energy of the object just before it hits the ground.
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