1.

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                                 [MP PMT 1999]

A.                         \[{{\cos }^{-1}}\left( -\frac{17}{18} \right)\]
B.                           \[{{\cos }^{-1}}\left( -\frac{1}{3} \right)\]            
C.                         \[{{\cos }^{-1}}\left( \frac{2}{3} \right)\]            
D.                           \[{{\cos }^{-1}}\left( \frac{8}{9} \right)\]
Answer» B.                           \[{{\cos }^{-1}}\left( -\frac{1}{3} \right)\]            


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