Give one example of each type of the following motion:

(a) uniform velocity (b) variable velocity

(c) variable acceleration (d) uniform retardation

(a) uniform velocity - a car travelling with constant speed on a straight road

(b) variable velocity - a car travelling on a circular track

(c) variable acceleration - a car moving on a circular track at variable speed

(d) uniform retardation - a ball thrown upwards from the ground