Answer:
Step-by-step explanation:
Unit vector is a vector with mangnitue 1 and we can find out the magnitude of the vector [tex]u = (x , y)[/tex] with the following formula
[tex]magnitude = \sqrt{x^{2}+y^{2}}[/tex]
So in the given options whichever vector has magnitude 1 it will be a unit vector.
So if we put the values in the above mentioned formula
1.Magnitude of option A is not 1 so it is not a unit vector
2.Magnitude of option B is 1 so it is a unit vector
3.Magnitude of option C is 1 so it is a unit vector
4.Magnitude of option D is not 1 so it is not a unit vector
