two bodies of masses 1 kg and 2 kg are located at (1,2) and (1,-3).what are the coordinates of the centre of mass?

Body A has mass of 1 kg and location (1,2)

Body B has mass of 2kg and location (-1,3)

m_cx_c = m₁x₁ + m₂x₂

(1+2) x_c = (1*1) + (2*-1)

x_c = -1/3

similarly

m_c y_c = m₁ y₁ + m₂ y₂

(1=2) y_c = (1*2)+(2*3)

y_c= 8/3

Hence the co-ordinates of the center of mass are ( -1/3 , 8/3).