The slope (m) of the graph is most likely used to determine the acceleration from a velocity vs time graph.
Step-by-step explanation:
Acceleration is referred as the ratio of velocity with respect to time traveled by the object. The formula to find out slope of the graph = (y2 - y1) / (x2 - x1).
To find the acceleration, calculate the slope of the graph as it will denote the acceleration. When the slope of the graph is zero, it means the acceleration of the object is zero and when it is positive, the acceleration is positive.