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Jadhav Singh
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Asked: 2021-02-11T07:15:56+00:00 In:

When the angle between two vectors of equal magnitudes is 2π/3, prove that the magnitude of the resultant is equal to either

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2020-2021cbsechapter 2class 11class 11 sciencekinematicncertphysicsscience
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    1 Answer

    1. R = (P2 + Q2 + 2PQ cos θ) ¹/²
      = (P² + Q² + 2P.P cos 2π/3)¹/²
      = [2P² + 2P² ( -1/2)] ¹/² = P

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