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Yes, a unit vector can have negative component since a unit vector has same magnitude and direction as a negative unit vector.

Here is the general work out of the problem:

Let |v| be the norm of (v1, v2). Then, the unit vector is (v1/|v|, v2/|v|). Determine the "modulus" or the norm |(v1/|v|, v2/|v|)| to get 1, which is the new norm. If we determine the norm of |(-v1/|v|, -v2/|v|)|, we still have the same norm 1.

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Q: Can unit vector have negative component?
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