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Suppose you have two forces overset(rarr...

Suppose you have two forces `overset(rarr)F` and `overset(rarr)F` how would you combine them in order to have resultant force of magnitudes (a) zero , (b) `2 overset(rarr)F` and (c ) `overset(rarr)F` ?

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Resultant of two vectors vary according to the angle between two vectors
(a) If they act at opposite direction, resultant is zero., i.e., for `theta =180^(@)` , R =0
(b) If they act in same direction, i.e., `theta =0,R =2F`
(c ) for the resultant to be F
`F^(2)=F^(2)+F^(2)+2F^(2) cos theta , cos theta =-1//2 ` or `theta =120^(@)`
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