Relative densities of two substance A and B are 2.5 and 0.9 respectively find the densities of A and B also find whether they will sink or float in water density of water is equal 2000 km metre cube

Relative Density of a substance = density of substance / density of water

Relative density of A = Density of A/density of water

Therefore; 2.5 = density of A / 1000 kg/m³

Density of A = 2.5 * 10³ kg/m³

Relative density of B = Density of B/density of water

0.9 = Density of B / 1000 kg/m³

Density of B = 0.9 * 1000 kg/m³

= 900 kg/m³

Therefore; substance A will sink in water as it is denser than water, ehile substance B will float as it is less denser than water.