Answer
$u$ and $v$ have the same direction.
Work Step by Step
The angle $\theta$ between $u$ and $v$ is equal to $0$.
$proj_vu=\frac{u\cdot v}{|v|^2}v=\frac{|u||v|~cos~0}{|v|^2}v=|u|\frac{v}{|v|}$
But, $\frac{v}{|v|}=\frac{u}{|u|}$ because $u$ and $v$ have the same direction ($\theta=0$).
$proj_vu=|u|\frac{u}{|u|}=u$
