While delivering a lecture on ` vectors` Phusics teacher told the students about zero vector or mnll vector, i.e. a vector which has zero magnitude and arbitray direction. It is represented by ` vec 0` (arrow ovet the numnet zero . The students wer baffled.
Read the above passage and answer the following questins :
(i) What was the becessity of the concept zero vector ? ltbRgt Give any one illustravion of zero vector.
(ii) What is the phusical significane of zero vector ?

Explanation

(i) The velocity of a stationary particle is zero . As velocity is a vector , therefore, velocity of stationary particle is represented by ` vec 0`. Similarly, accelration of a particle moving with uniform velocity is represented by ` vec 0`.
(ii) When a verctor is added to its won negatyive vector, the resultanct vector is ` vec 0`. i.e. vec A + (- vec A) = vec 0`.
(iii) the concept of zero vector is useful in describing the phusical situations invloving vector quantities.