Don't slide

A small block $B$ is supported by a platform connected at $A$ to rod $OA$ . point $A$ describes a circle in a vertical plane at a constant speed $v_{A}$ , The coefficient of friction between the block and the platform are $\mu_{s}=\frac{1}{\sqrt{3}}$ and $\mu_{k}=\frac{1}{\sqrt{5}}$ . The maximum speed $v_{A}$ , for the block not to slide on the platform is in $m/s$