Which of the following graphs represents uniform motion?

The $v-t$ graph of a rectilinear motion is shown in the adjoining figure. The distance from the starting point after $8 \text{ s}$ is .......... $\text{m}$.

The velocity-time graph of a body moving along a straight line is shown in the figure. The ratio of the average velocities during the time intervals $t_1$ and $t_2$ is:

Which one of the following represents the displacement-time graph of two objects $A$ and $B$ moving with zero relative velocity?

An object is moving with variable speed,then

For the velocity-time graph shown in the figure,what fraction of the total distance covered in all seven seconds is the distance covered by the body in the last two seconds of its motion?