The total energy of satellite moving with an orbital velocity  around the earth is

a)

b)

c)

d)

(b)

Let a satellite is revolving around earth with orbital velocity . The gravitational potential energy of satellite is

The kinetic energy of satellite is

Total energy of satellite

                        …(iii)

But we know that necessary centripetal force to the satellite is provided by the gravitational force.

Hence, from Eqs. (iii) and (iv), we get