From Mechanics

Here we use the equation \displaystyle \mathbf{v}=\mathbf{u}+\mathbf{a}t with

\displaystyle \mathbf{u}=$4\backslash mathbf\{i\}+6\backslash mathbf\{j\}\backslash text\{\; m\}\{\{\backslash text\{s\}\}^\{\backslash text\{-1\}\}\}$ and \displaystyle \mathbf{v}=24\mathbf{i}+46\mathbf{j\text{ m}{{\text{s}}^{\text{-1}}}}.

Also \displaystyle t=20\text{ s}