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Solve this sum from vectors

  1. Mar 25, 2012 #1
    The resultant of two forces 3p and 2p is R.If the first force is doubled then the resultant is also doubled.The angle between the two forces is?plz explain answer to me,i dont want direct numerical value.
  2. jcsd
  3. Mar 25, 2012 #2
    What is the magnitude of resultant vector in terms of |A| |B| and theta,

    Where |A| , |B| are magnitudes of vectors being added and theta is angle between them
  4. Mar 25, 2012 #3
    Use Law of Cosines
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