Is d=r=0.5m or d=2r, so r=0.25m for Gravitational Potential Energy?

[Andrei0408]

Homework Statement

Find the gravitational potential energy of a body with the mass m1=70g in the gravitational field of a body with mass m2=60g placed at d=0,5 m. The universal gravitational constant is K=6,67∙10 ^ -11 N * m^2 / kg^2

Relevant Equations

Epg = -K * M*m / r

I know I just have to replace in the equation, I just want to know, is d=r=0.5 m or is d=2r, so r = 0.25 m ?

 

[Frigus]

d=r=0.5 m

This one seems to be correct.

 

[Andrei0408]

Thanks!