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Card 20 / 22:
unit vector
a vector that begins at the origin and has magnitude of 1; the horizontal unit vector runs along the x -axis and is defined as v 1 = ⟨ 1 , 0 ⟩ the vertical unit vector runs along the y -axis and is defined as v 2 = ⟨ 0 , 1 ⟩ .
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