$\omega \propto \sqrt{\frac{g_{e f f}}{\ell}}$

$\therefore \quad \frac{\Delta \omega}{\omega}=\frac{1}{2} \frac{\Delta g_{e f f}}{g_{e f f}}$

$\Delta \omega=\frac{1}{2} \frac{\Delta g}{g} \times \omega$

$[ \omega_{s}=$ angular frequency of support] 

$\frac{\Delta \omega}{\omega}=\frac{1}{2} \times \frac{\Delta g}{g}$

$=\frac{1}{2} \times \frac{2\left(\mathrm{A} \omega_{5}^{5}\right)}{10}$

$\Rightarrow \frac{\Delta \omega}{\omega}=\frac{1 \times 10^{-2}}{10}=10^{-3}$