question_answer

Two forces, \[{{F}_{1}}\] and  \[{{F}_{2}}\] 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)                 \[{{\cos }^{-1}}(1/2)\]

B)                             \[{{\cos }^{-1}}(-1/2)\]

C)                 \[{{\cos }^{-1}}(-1/4)\]  

D)                 \[{{\cos }^{-1}}(1/4)\]