(a) ​A cube of side 5 cm is immersed in water and then saturated salt solution. In which case will it experience a greater buoyant forces ? If each side of the cube is reduced to 4 cm and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water. Given reason for each case.

$\left(b\right) A ball weighing 4 kg of density 4000 kg/m^3 is completely immersed in water of density {10}^3 kg/m^3. Find the buoyant force on it. \left(Given g=10m/s^2\right)$