Question

Two forces F1 and F2 are acting on a body. One force is double that of the other force and the resultant is equal to the greater force. Then the angle between the two forces is -

(a) $cos^{-1}(\dfrac{1}{2})$

(b) $cos^{-1}(\dfrac{-1}{2})$

(c) $cos^{-1}(\dfrac{-1}{4})$

(d) $cos^{-1}(\dfrac{1}{4})$​

Answer 1

Solution is given in the picture.,

(c) cos theta = -1/4

Answer 2

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