Area under a speed-time graph is equal to the

Why is the motion of an athlete moving along a circular path considered an accelerated motion?

Two cars $A$ and $B$ have their displacement-time graph as given below. Which car has a greater velocity?

$A$ moving body is covering a distance directly proportional to the square of time. The acceleration of the body is

Can you suggest the kind of motion of a body from the following distance-time graphs?

Four speed-time graphs are shown below. Which graph represents the following cases?
$(i)$ $A$ ball thrown vertically upwards and returning to the hand of the thrower.
$(ii)$ $A$ body decelerating to a constant speed and then accelerating.