Determine gravitational potential from gravitational potential energy.

Explanation

(i) Consider two masses `m_(1)` and `m_(2)` separeted by a distance r which has gravitational potential energy U(r)/
(ii) The gravitational potential due to mass `m_(1)` at a point P which is at a distance r from `m_(1)` is obtained by making `m_(2)` equal to unity `(m_(2) = 1 kg)`
(iii) Thus the gravitational potential V(r) due to mass m = 1 at a distance r is
`V (r) = (Gm_1)/(r)`.