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A body released at the distance r (r > R) from the centre of the earth. What is the velocity of the body when it strikes the surface of the earth ?

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A body released at the distance r (r > R) from the centre of the earth. What is the velocity of the body when it strikes the surface of the earth ? 

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Total Energy of the body = KE + PE 

Let v be velocity acquired by body on reaching the surface of earth.

According to law of conservatives of energy

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