alleryA unit vector along a non-zero vector $\vec a$ is given by:
A$\vec a / |\vec a|$
B$|\vec a| \cdot \vec a$
C$\vec a / 2$
D$2\vec a / |\vec a|^2$
Answer & Solution
Correct answer: A. $\vec a / |\vec a|$
$\hat a = \vec a / |\vec a|$ — divide a vector by its magnitude to get a unit vector in the same direction.
It always has magnitude 1.
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