Four objects of mass 1 kg each are placed on 4 corners of a square of side 1 m as shown in the figure. Consider “O” to be the origin. What is the position of the centre of mass ?

1/2 (i + j) m

Sum of masses = 1 + 1 + 1 + 1 = 4

x-coordinate : (1 x 0 + 1 x 1 + 1 x 1 + 1 x 0)/4 = 1/2

y-coordinate : (1 x 1 + 1 x 1 + 1 x 0 + 1 x 0)/4 = 1/2

Position of centre of mass = 1/2 (i + j) m.