The gravitational potential energy of a body at a distance “r” from the centre of the earth is V. Its weight at a distance “2r” from the centre of the earth is : 

V/4r

 Gravitational potential energy (V) at a distance “r”;

V = -(G*M*m)/r

Gravitational force at a distance “r” = -(G*M*m)/r²

= V/r

Gravitational force at a distance “2r” = -(G*M*m)/4r²

= V/4r.