2 uniform thin rods of length L ad mass m are joined. find distance of centre of mass the system from point o
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Centre of mass of upper rod is at O.
Centre of mass of lower rod is at L/2 from O.
Along vertical line
y_cm = (m1y1 + m2y2) / (m1 + m2)
= (0 + mL/2) / (2m)
= L/4
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