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Two forces with equal magnitudes F act o...

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

A

`cos^-1(-17/18)`

B

`cos^-1(-1/3)`

C

`cos^-1(2/3)`

D

`cos^-1(8/9)`

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The correct Answer is:
A
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