Flying of a bird is an example of resultant of two vectors.
i) When the bird flies, it strikes the air with wings A and B towards O along
ii) Action and reaction are opposite. Therefore, the air strikes the wings in opposite direction i.e. along .
iii) The resultant of these vectors is in the upward direction which balances the weight of the bird.
The resultant of the two vectors lie in the same plane. Hence, three vectors in single plane cannot give the resultant zero. For the resultant of three vectors to be zero, resultant of two should be equal and opposite to the third.
Here, since the three vectors do not lie in the same plane, the resultant of the two cannot be in opposite direction of the third, hence resultant can not be zero.