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Two vectors of magnitudes 5 and 12 have a resultant of magnitude 13. The angle between them is

  • A.90 degrees
  • B.0 degrees
  • C.180 degrees
  • D.60 degrees

Answer: A

For perpendicular vectors the resultant is the square root of the sum of the squares, and \( \sqrt{25 + 144} = 13 \). The arithmetic sum of seventeen would require them to be parallel and the difference of seven antiparallel.

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