Here we have \displaystyle \mathbf{a}=0.2\mathbf{i}+0.3\mathbf{j},\ \ \displaystyle \mathbf{u}=4\mathbf{i}– 8\mathbf{j}\ \ and \displaystyle \mathbf{ r}_{0}=6\mathbf{i}+2\mathbf{j}.
