Two spacecraft, X X\,X and YYY, are in stable circular orbits around a planet of mass MMM. Spacecraft X X\,X has a mass of 3m and orbits at a radius of RRR. Spacecraft Y Y\,Y has a mass of m m\,m and orbits at a radius of 3R3R3R.
Which of the following physical quantities is greater for spacecraft Y Y\,Y than for spacecraft XXX?
Kinetic energy of the spacecraft
Gravitational potential energy of the spacecraft
Linear speed of the spacecraft
Gravitational force exerted on the spacecraft by the planet
