Physics

Problem

Which one of the following gives the speed

v

of a satellite of negligible mass revolving in a circular orbit of radius

r

about a planet of mass

M

? a)

v=\sqrt{\dfrac{GM}{2r}}

v=\sqrt{\dfrac{2GM}{r}}

v=\sqrt{\dfrac{GM}{r}}

v=\sqrt{\dfrac{GM}{r+R}}