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  4. A body falls freely towards the earth from a height 2 R, above the surface of the earth, where initially it was at rest. If R is the radius of the earth then its velocity on reaching the surface of the earth is:

Q. A body falls freely towards the earth from a height , above the surface of the earth, where initially it was at rest. If is the radius of the earth then its velocity on reaching the surface of the earth is:

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Solution:

Initial energy of the body

Final energy of the body
where is the mass of the body and is the mass of the earth. By conservation of energy




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