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
(67)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)