The slope of a body's average acceleration during time interval 't' is given by:

Concept: A motion like the one shown above exemplifies an important principle: the slope of a line on a velocity-time graph equals the object's acceleration. 

This principle can be applied to all velocity-time systems to calculate the numerical value of acceleration. Acceleration is the rate at which velocity changes over time. 

The slope of the velocity time graph gives the acceleration produced when we plot velocity along the Y-axis and time along the X-axis. 

The slope of a body's velocity-time graph represents its average acceleration over time interval 't.'