A satellite orbits a planet in a circular path very close to its surface. The planet has a radius R R\,R and the magnitude of the gravitational field strength at its surface is ggg.
What is the orbital speed of the satellite?
gR\sqrt{gR}gR
2gR\sqrt{2gR}2gR
12gR\frac{1}{2}gR21gR
gRgRgR