The coordinates of the centre of mass of a uniform flag-shaped lamina (thin flat plate) of mass 4 kg. (The coordinates of the same are shown in the figure) are:\\
(1) $( 1.25 \mathrm {~m} , 1.50 \mathrm {~m} )$\\
(2) $( 0.75 \mathrm {~m} , 1.75 \mathrm {~m} )$\\
(3) $( 0.75 \mathrm {~m} , 0.75 \mathrm {~m} )$\\
(4) $( 1 \mathrm {~m} , 1.75 \mathrm {~m} )$