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 _____(a) V/r(b) V/4r(c) V/2r(d) 4V/r
Right option is (b) V/4rBest explanation: Gravitational potential energy (V) at a distance “r”;V = -(G*M*m)/rGravitational force at a distance “r” = -(G*M*m)/r^2 = V/rGravitational force at a distance “2r” = -(G*M*m)/4r^2 = V/4r.