Answer
$i$
Work Step by Step
If $v=ai+bj+ck$ and $||v||=\sqrt{a^2+b^2+c^2}$, then the unit vector $u$ in the same direction as $v$ is
$u=\frac{v}{||v||}$.
The magnitude of $v$ is
$||v||=\sqrt{5^2+0^2+0^2}\\
||v||=\sqrt{25+0+0}\\
||v||=\sqrt{25}\\
||v||=5$
Thus the unit vector in the same direction is $v$ is:
$u=\frac{5i}{5}
\\u=i$
