A cylinder of mass $2 \mathrm{kg}$ is released from rest from the top of an inclined plane of inclination $30°$ and length $1 \mathrm{m}$. If the cylinder rolls without slipping, then its speed when it reaches the bottom is [$g=10 \mathrm{m} {\mathrm{s}}^{-2}$]

A uniform rod of length $l$ and mass $m$ is free to rotate in a vertical plane about $A$. The rod initially in horizontal position is released. The initial angular acceleration of the rod is (Moment of inertia of rod about $A$ is $\frac{m{l}^2}{3}$)