Newton's law of universal gravitation states that the gravitational force exerted by an object on any other object anywhere in the universe is given by
F=
Gm.ma
where G is the universal gravitational constant (= 6.67 × 10 -11 N.m 2/kg 2), my is mass 1, m2 is mass 2, and r is the distance between the two masses (from center to center). If both masses my and m2 are doubled, the gravitational force between the two masses