Physics - Rotation Question with Solution | TestHub

The discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc $D_1$ has $2\mathrm{kg}$ mass and $0.2\mathrm{m}$ radius and initial angular velocity of $50\mathrm{rad}{\mathrm{s}}^{-1}$. Disc ${\mathrm{D}}_2$ has $4\mathrm{kg}$ mass, $0.1\mathrm{m}$ radius and initial angular velocity of $200\mathrm{rad}{\mathrm{s}}^{-1}$. The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad $s^{-1}$ ) of the system is:NEET 2013 (Karnataka)