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4. 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)       c0s -1 (-17/18)                           (b) cos -1 (-1/3)

(c)    cos -1 (2/3)                        (d) cos (8/9)

Ans. a

(61)

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