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A unit vector has

  • A.unit magnitude and the direction of the vector it is derived from
  • B.unit magnitude and a direction along one of the coordinate axes only
  • C.the magnitude of the original vector but no particular direction
  • D.no magnitude at all

Answer: A

It is obtained by dividing a vector by its own magnitude, which strips the size and keeps the orientation. Writing a vector as a magnitude times a unit vector separates cleanly what is geometrical from what is merely a number.

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