They are vectors of equal magnitudes in oppositedirections. When you add them, they cancel out each other.
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A unit vector is a vector whose magnitude is one. Vectors can have magnitudes that are bigger or smaller than one so they would not be unit vectors.
yeah, it can. for example consider two antiparallel vectors of magnitude 5,3 whose resultant is 2, which is smaller than both components.....
Two is the minimum number of vectors that will sum to zero.