If you want the graph to show the acceleration of the ball against time, then the graph is a horizontal line. If you want the graph to show the velocity of the ball against time, then the graph is a straight line sloping downward. If you want the graph to show the height of the ball against time, then the graph is a parabola that opens downward.
If you are analyzing speed with respect to time, then you are decelerating.
An upward sloping straight line indicates that the object being studied is moving away from the origin and that the component of its velocity in the radial direction is a constant. A downward sloping line indicates it is moving towards the origin. However, neither line says anything about the transverse component of its motion.
A straight line graph with negative slope slants downward from left to right.
A straight line, through the origin, sloping up from left to right. The gradient of the graph will be the constant of proportionality.
An upward sloping straight line.
It is accelearting at a constant rate.
The downward tend on a graph is called "decay".
This means your velocity is decreasing with time, or in other words, the object is slowing down.
An Upward Sloping Straight Line. <3