A solid cylinder is released from rest from the top of an inclined plane of inclination $30^{\circ}$ and length $60 \mathrm{~cm}$. If the cylinder rolls without slipping, its speed upon reaching the bottom of the inclined plane is __________ $\mathrm{ms}^{-1}$. (Given $\mathrm{g}=10 \mathrm{~ms}^{-2}$)