1.

If mass of earth is M, radius is R and gravitational constant is G, then work done to take 1 kg mass from earth surface to infinity will be                           [RPET 1997]

A.             \[\sqrt{\frac{GM}{2R}}\]      
B.             \[\frac{GM}{R}\]
C.             \[\sqrt{\frac{2GM}{R}}\]
D.               \[\frac{GM}{2R}\]
Answer» C.             \[\sqrt{\frac{2GM}{R}}\]


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