Two research satellites, X X\,X and YYY, are in circular orbits around the same planet. Satellite X X\,X has mass m m\,m and orbits at a radius RRR. Satellite Y Y\,Y has mass 4m and orbits at a radius 2R2R2R.
Which of the following quantities is the same for both satellites?
The gravitational force acting on the satellite
The kinetic energy of the satellite
The orbital speed of the satellite
The gravitational potential energy of the satellite
