1.

If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of earth to a height equal to the radius of the earth R, is                          [IIT 1983]

A.             \[\frac{1}{2}mgR\]
B.               2 mgR
C.             mgR    
D.             \[\frac{1}{4}mgR\]
Answer» B.               2 mgR


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