From Mechanics

\displaystyle \begin{align} & u=0\ \text{ m}{{\text{s}}^{-1}},\quad a=\text{9}\textrm{.}\text{8}\ \text{ m}{{\text{s}}^{-2}},\quad s=\text{2 m} \\ & {{v}^{2}}={{u}^{2}}+2as \\ & {{v}^{2}}={{0}^{2}}+2\times 9\textrm{.}8\times 2 \\ & v=6\textrm{.}26\text{ m}{{\text{s}}^{\text{-1}}} \\ \end{align}