Answer
See the figure below.
Work Step by Step
It is obvious, especially from the velocity and acceleration versus time graphs, that the ball motion has 3 stages.
In the first stage, the ball starts from rest and speeds up.
In the second stage, the ball moves at a constant velocity.
In the third stage, the ball speeds up again in the same direction.
It seems that the ball moves down a tilted plane (an inclined surface), then moves in a straight line, and finally moves down another tilted plane with a greater angle with the horizontal which makes its acceleration in the third stage greater than that of the first stage.
The three surfaces are assumed to be frictionless.
See the figure below.
