What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?

Explanation

E = Energy of satelllite - energy of mass on the surface of planet
`= -(GMm)/(2R)-((-GMm)/(R))`
Here, `r = R+2R = 3R`
Substituting the values in above equation we get, `E =5(GMm)/(6R)`
The correct answer is (a).