Collinear Vectors Two or more vectors are said to be collinear if they are parallel to
the same line, irrespective of their magnitudes and directions Equal Vectors Two vectors 
aand 
rb
r
 are said to be equal, if they have the same
magnitude and direction regardless of the positions of their initial points, and written
as 
a =
rb
r Negative of a Vector A vector whose magnitude is the same as that of a given vector
(say, AB
uuur ), but direction is opposite to that of it, is called negative of the given vector For example, vector BA
uuur  is negative of the vector AB
uuur , and written as BA
uuur= −AB
uuur