If ‘r’ represents the radius of the orbit of a satellite of mass ‘m’ moving round a planet of mass ‘M’, the velocity of the satellite is given by
v2 = $\dfrac{gM}{r}$
v2 = $\dfrac{GMm}{r}$
v = $\sqrt{\dfrac{GM}{r}}$
v = $\dfrac{GM}{r^{2}}$
Easy Tutorial
For Competitive Exams