The gravitational force between two masses separated by distance of one metre is F. The same two masses are kept in water and separated by distance 1 m. Then gravitational force between the two masses

The gravitational force between any two bodies that have some mass is given as:

${\text{F}}_{ }=\text{G}.\frac{{\text{m}}_{\text{1}}{\text{m}}_{\text{2}}}{{\text{r}}_{ }^2}$
Where m₁ and m₂ are the masses of the two bodies, r is the distance between them and G is the universal gravitation constant.
$G= 6.67 X {10}^{-11} N{m}^2/k{g}^2$

The value of G is constant for any two bodies involved and is independent of the medium in which the bodies lie.
Therefore, we can say that gravitational force is independent of the medium.
Hence the force will be equal to F.