(a) Uniform Velocity - A body is said to have uniform velocity if it covers equal distance in equal intervals of time in a particular direction, however the time intervals may be small

(b) Variable Velocity - When a train stops in a platform its velocity changes in every moment. Its an example of variable velocity.

(c) Example of variable acceleration are velocity increases in unequal amount with equal interval. For example, a car is moving in a crowded street, when car find space it will move with greater speed and if it stuck in crowd then it will move with less speed.

(d) Examples of uniform retardation are:1) Velocity of vehicle decreases when brake is applied.2) Landing of aeroplane. 3) When fan is switched off. 4) A train reaching at a station.

uniform velocity-A bus travelling towards east with a speed of 20km/hvariable velocity-A car travels with a 20km/h east,then turns to north with different speed or same speedvariable acceleration - A bus accelerates for 2m/s^2 and then accelerates for 10m/s^2uniform retardation- A bus applies brakes and comes to test with a uniform retardation of 5m/s^2