Object B has a length of 10 cm a width of 5 cm and a height 2 cm. Its mass is 300g. Find the density of object B.?

To find the density of object B, calculate its volume first: 10 cm (length) * 5 cm (width) * 2 cm (height) = 100 cm^3. Then, divide the mass by the volume: 300g / 100 cm^3 = 3 g/cm^3. The density of object B is 3 g/cm^3.