Question

A satellite of mass ${}^{\prime }{m}^{\prime }$ is revolving around the earth in an orbit of radius $10R$ ($R$ is the radius of earth), the minimum energy required to give the satellite so that it can escape the gravitational field of the earth is [mass of earth$=M_e$]:

• A. $\frac{G{M}_{e}m}{20R}$
• B. $\frac{G{M}_{e}m}{10R}$
• C. $\frac{G{M}_{e}m}{R}$
• D. $\frac{G{M}_{e}m}{2R}$

Answer 1

The correct option is A $\frac{G{M}_{e}m}{20R}$