Centre of Mass of Rigid Body with Uniform Density #8211; The density is given by, p = dm/d V = M/V Then, X<sub>CM</sub> = 1/V ∫x d V Y<sub>CM</sub> = 1/V ∫y d V and Z<sub>CM</sub> = 1/V ∫z d V where, V is the total volume of the body and (x, y, z) are the coordinates of considered elementary volume d V.