Following table gives the displacement of a car at different instants of time. Draw the displacement-time sketch and find the average velocity of car.

Time(S)	0	1	2	3	4
Displacement (m)	0	5	10	15	20

Displacement-time graph

Finding average velocity:
We know that the slope of the displacement time graph represents velocity. Here displacement-time graph is a straight line with constant slope. Hence, velocity is constant here.
$\text{Average velocity}$
$=\frac{\text{total displacement}}{\text{total time}}$
$=\frac{\text{final position-initial position}}{\text{total time}}$
$=\frac{20-0}{4-0}=5\text{m}\text{s}{}^{-1}$
Hence, average velocity of the car is $5{\text{ms}}^{-1}$.