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Questions  

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

a
450
b
1200
c
1500
d
600

detailed solution

Correct option is B

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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