A uniform circular disc of radius $\text{50}\text{ cm}$ at rest is free to rotate about an axis which is perpendicular to its plane and passes through its centre. It is subjected to a torque which produces a constant angular acceleration of $2.0\mathrm{ }\mathrm{r}\mathrm{a}\mathrm{d}\mathrm{ }{\mathrm{s}}^{-2}$. Its net acceleration in $\mathrm{m }{\mathrm{s}}^{-2}$ at the end of $\text{2.0 s}$ is approximately: