Physics - Rotation Question with Solution | TestHub

A thin uniform circular disc of mass$\mathrm{m}$and radius$\mathrm{R}$is rotating in a horizontal plane about an axis passing through its centre and perpendicular to the plane with an angular velocity$\mathrm{\omega }$. Another disc of same dimensions but of mass$\frac{1}{4}\mathrm{m}$is placed gently on the first disc co-axially. The angular velocity of the system is