vectors-m

Question: ABCDE is a pentagon. Forces $\overrightarrow{AB},\,\overrightarrow{AE},\,\overrightarrow{DC},\,\overrightarrow{ED}$ act at a point. Which force should be added to this system to make the resultant ${{\cos }^{-1}}\frac{4}{5}$



1) $\overrightarrow{AC}$
2) $\overrightarrow{AD}$
3) $\overrightarrow{BC}$
4) $\overrightarrow{BD}$
Solution: Explanation: No Explanation
Modulus of vector Algebra of vectors

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