the critical velocity of satellite of mass 100kg moving around a planet is 20m/s. If another satellite of mass 200kg is kept moving in the same orbit then its critical velocity will be:

Critical velocity of a satellite = Vc = (  GM/ r)^1/2  where G = universal gravitational constant,
                                                                                           M = mass of planet and r = radius of orbit
Hence, critical velocity of a satellite is independent of its mass.
            i.e the new critical velocity will be same as the first.