If the acceleration due to gravity at the surface of the earth is g, the work done in slowly lifting a body of mass m from the earth's surface to a height R equal to the radius of the earth is
A
mgR2
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B
2mgR
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C
mgR
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D
mgR4
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Solution
The correct option is AmgR2 ui=GMR=mgRuf=GMm2R=GMR2.(MR2)=mgR2∴w=mgR2