physics
posted by Jennifer .
Satellite A orbits a planet with a speed of 10,000 m/s. Satellite B is twice as massive as satellite A and orbits at twice the distance from the center of the planet. What is Satellite B's speed?

centripetal force = gravitational force
mass*v^2/r=mass*(GMe/r^2)
v^2=GMe/r
So the velocity is dependent on the distance from the center of the Earth only (GMe is a constant).
I will be happy to critique your thinking on the answer. 
vbv