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2015-05-04T02:39:06+05:30

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Magnitudes of forces = P and P.
let Ф be the angle between them.

magnitude of Resultant = P²  = P² + P² + 2 P P Cos Ф

       =>  CosФ = -1/2
       =>  Ф = 120 deg or  2π/3

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