Find the orbital speed v of a satellite in a circular orbit of radius r around a planet of mass m. express the orbital speed in terms of g, m, and r.

For a satellite orbiting around a planet of mass m in an orbit of radius r with a velocity v we have

Fc=Fg

m'v^2/r=G*m*m'/r^2 Where m is the mass of the planet and m' is the mass of satellite

v^2 = G*m/r

v = (G*m/r) ^1/2