If I have a Ug of 12 Joules and I double Q and q then what is my new value of Ue? Equation: Ue = kQq/r where k = 9.0 x10^9 Nm^2/C^2

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory