Physics - Rotation Question with Solution | TestHub

A thin uniform circular disc of mass ' $\mathrm{M}$ ' and radius ' $R$ ' is rotating with angular velocity ' $\omega$ ', in a horizontal plane about an axis passing through its centre and perpendicular to its plane. Another disc of same radius but of mass $\left(\frac{M}{2}\right)$ is placed gently on the first disc co-axially. The new angular velocity will be