Relationship between Gravitational Potential Energy (Ep)and Gravitational Potential (V)

Really don't know what to write for this question. Don't understand it. Anyone?

Equation for gravitational potential energy is Ep=mV, Where m is the mass of a body in a gravitational field and V is the Gravitational potential.

So if the mass doubles the Ep doubles ( since gravitational potential at a given point in the field is constant)


Equation for gravitational potential is V=-GM/r. This mass is the mass of the planet causing the gravitational potential, not the mass of the body, so in this case the mass of the body has no effect.