Question

A system consists of two masses connected by a massless rod lies along x–axis. The distance of centre of mass from O is

Moderate

Solution

$x_{cm} = \frac{m_{1} x_{1} + m_{2} x_{2}}{m_{1} + m_{2}} = \frac{0.4 \times 2 + 0.6 \times 7}{0.4 + 0.6} = 5 m$

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