(i) Magnitude of displacement of a particle in motion for a given .time is the shortest distance between the total length of the path covered by particle is the length of actual path traversed by the particle in the given time.
(ii) Let us consider an example
A car starts from O and moves along positive x-axis. The car stops "at B and starts moving towards negative x-axis. Finally, the car reaches at A.
For the motion from O to B,
So, |Displacement| = Distance covered
|Average velocityl = Average speed
For the motion from O—>B—>A So, | Displacement| < Distance covered
|Average velocity| < Average speed