Two forces, each of magnitude F have a resultant of the same magnitude F. The angle between the two forces is

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450

1200

1500

600

answer is B.

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Detailed Solution

R=A2+B2+2ABcos⁡θ By substituting, A=F,B=F and R=F we get cos⁡θ=-12 ∴θ=120∘

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