If the displacement-time graph for a particle is parallel to the displacement axis,what is the velocity of the particle?

$A$ body thrown in the vertically upward direction rises up to a height $h$ and comes back to the position of its start. Calculate: $(a)$ the total distance travelled by the body and $(b)$ the displacement of the body. Under what condition will the magnitude of the displacement be equal to the distance travelled by an object?

Study the speed-time graph of a body given below and answer the following questions:
$(i)$ What type of motion is represented by $OA$,$AB$ and $BC$?
(ii) Find positive and negative accelerations of the body.
(iii) Find the distance travelled by the body from $A$ to $B$.

What type of motion is represented by the following graphs?

The position-time graph for the motion of a car is given below.
$(i)$ How far did the car travel in the time interval $2 \, s$ to $6 \, s$?
(ii) During which interval of time was its speed greater?
(iii) Calculate the average speed of the car.

"The direction in which an object moves is given by the direction of velocity of the object and not by the direction of acceleration." Give an example to justify this statement.