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If g is acceleration due to gravity at the surface of earth, the work done to lift a body of mass ‘m’ from the surface of the earth to a height equal to the radius of the earth (R) is

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2mgR

mgR

mgR/2

mgR/4

answer is C.

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Detailed Solution

$W = m g h (\frac{R}{R + h}) = m g R (\frac{R}{R + R}) = \frac{m g R}{2}$

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