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An equilateral traingular plate of mass ...

An equilateral traingular plate of mass `4m` of side a is kept as shown. Consider two cases: (i) a point mass `4m` is placed at the vertex P of the plate (ii) a point mass `m` is placed at the vertex R of the plate. In both cases the x-coordinate of centre of mass remains the same. Then x coordinate of centre of mass of the plate is

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