The of the line on a velocity vs. time graph represents acceleration.

The slope

Explanation:

The slope of the line on a velocity vs. time graph represents acceleration.Acceleration is the velocity made by a moving body per unit time. In other words is velocity per unit time. Acceleration is given by the formula;Acceleration = (final velocity -initial velocity)/time. This means acceleration depends on time taken to attain a given velocity and velocity of the moving body.The SI units of acceleration are; meters/square seconds(m/s²)

The center is basically the heart of it