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 Remark The vectors defined above are such that any of them may be subject to its
parallel displacement without changing its magnitude and direction