The resultant of two vectors 3P and 2P is R. If the first vector is doubled, then the resultant is also doubled. The angle between the two vectors is

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answer is B.

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Detailed Solution

Resultant, R=9P2+4P2+12P2cosθ …(i) 2R=36P2+4P2+24P2cosθ …(ii)Equating Eqs. (i) and (ii), we getcosθ=-12∴ θ=120°

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