$($d$)$ Figure $2\mathrm{.}3$ shows an object weighing $150N$ is set at $0\mathrm{.}250m$ from the left of a rigid beam of $20\mathrm{.}0kg.$ A vertical force $F=120N$ is applied at $0\mathrm{.}550m$ from the left of the beam.

Figure $2\mathrm{.}3$

Calculate the centre of gravity of the system from the left end of the beam.

$=0\mathrm{.}369m$