A metal wire of length 0.5 m and cross-sectional area  ${10}^{-4}{\mathrm{m}}^2$ has breaking stress $5\times {10}^{8 }{\mathrm{Nm}}^{-2}$. A block of 10 kg is attached at one end of the string and is rotating in a horizontal circle. The maximum linear velocity of block will be____ ${\mathrm{ms}}^{-1}$