question_answer

The escape velocity of a sphere of mass m is given by (G = universal gravitational constant, M= mass of the earth and Re = radius of earth) :

A)  \[\sqrt{\frac{2GMm}{{{R}_{e}}}}\]                   

B)  \[\sqrt{\frac{2GM+{{R}_{e}}}{2{{R}_{e}}}}\]

C)  \[\sqrt{\frac{GM}{2{{R}_{e}}}}\]                        

D)  \[\sqrt{\frac{2GM}{{{R}_{e}}}}\]