Question

Two forces, with equal magnitude $F$, act on a body and the magnitude of the resultant force is $\frac{F}{3}$. The cosine of angle between the two forces is:

• A. $\frac{-17}{18}$
• B. $\frac{17}{18}$
• C. $\frac{1}{3}$
• D. $\frac{-1}{3}$

Answer 1

The correct option is A $\frac{-17}{18}$