NEET Questions Solved

PMT - 1999

Two forces with equal magnitudes F act on a body and the magnitude of the resultant force is F/3. The angle between the two forces is 

(1) cos11718

(2) cos113

(3) cos123

(4) cos189

(1) Fnet2=F12+F22+2F1F2cosθ

F32=F2+F2+2F2cosθ

cosθ=1718

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