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 :
Answer & explanation
Correct answer: option 3
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.