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Q.

Two forces, each equal to F, act as shown in figure. Their resultant is

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a

F/2

b

F

c

2F

d

5F

answer is B.

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Detailed Solution

Note that the angle between two forces is 120o and not 60o.      R2=F2+F2+2F2cos⁡120∘           =2F2+2F2−12F2 or  R=F
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