Acceleration is the slope of a velocity vs. time graph.

Here's why:

* Slope: The slope of a line is calculated as the change in the vertical axis (velocity in this case) divided by the change in the horizontal axis (time).

* Acceleration: Acceleration is the rate of change of velocity over time.

Therefore, the slope of a velocity vs. time graph represents the change in velocity over time, which is precisely the definition of acceleration.

Key Points:

* Positive slope: Indicates positive acceleration (velocity increasing).

* Negative slope: Indicates negative acceleration (velocity decreasing).

* Zero slope: Indicates constant velocity (no acceleration).

Let me know if you'd like to explore any specific examples or scenarios related to this!