Projections

Find the length of $\mathrm{proj}_{\vec{e}}(\vec{a})$ for the following vectors

If you need some particular numbers for this calculation put $\vec{e} = \begin{pmatrix}1&0\end{pmatrix}^{\mathsf{T}}$ and $\vec{a} = \begin{pmatrix}0&1\end{pmatrix}^{\mathsf{T}}$.