The velocity-time graph of a body is as shown. What type of motion does the body possess?

The speed-time graph of a body is a straight line parallel to the time axis. The body has:

Draw velocity-time graphs for the following situations:
$(i)$ When a body is moving with uniform velocity.
$(ii)$ When a body is moving with variable velocity,but uniform acceleration.
$(iii)$ When a body is moving with variable velocity,but uniform retardation.
$(iv)$ When a body is moving with variable velocity and variable acceleration.

What can we conclude about the motion of a body depicted by the following velocity-time graphs?

Two graphs for the motion of objects moving along a straight line are shown. State how the speed is changing with time in both cases.

$A$ car is moving on a straight road with uniform acceleration. The following table gives the speed of the car at various instants of time.

Time $(s)$	$0$	$10$	$20$	$30$	$40$	$50$
Speed $(m s^{-1})$	$5$	$10$	$15$	$20$	$25$	$30$

$(i)$ Draw the speed-time graph representing the above set of observations.
$(ii)$ Find the acceleration of the car.