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The amount of work done in lifting a body of mass ‘m’ from the surface of the earth to a height equal to twice the radius of the earth is

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$large frac {3GMm}{5R}$

answer is A.

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Detailed Solution

$large U_i=-frac {GMm}{R};U_f=-frac {GMm}{3R}$
W = ΔU = U_f - U_i

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