The orbital velocity of a satellite does not depend upon the mass of the planet around which it orbits. By definition, a geosynchronous satellite orbits the earth in a perfect circle, maintaining the same distance above the surface of the earth. Satellites travel faster along their orbital path when they are closest to the earth. The acceleration of a satellite varies inversely with its distance from the center of the earth. More distant satellites have smaller accelerations.
Gravity is the only force on a satellite.
Therefore a satellite is a projectile. Click to view a way-cool animation . This inverse relationship is consistent with the equation for orbital velocity. In order to sweep out equal areas in equal times , a satellite must be moving faster when closest to the earth. See a clever animation .