* The slope of the line is negative. This means the speed is decreasing over time.
* The line is sloping downwards. This visually represents the decrease in speed.
Visual Example:
Imagine a straight line on the graph that starts at a high speed and gradually slopes downwards to a lower speed. This represents an object slowing down, which is negative acceleration.
Key Point: Remember, acceleration is about the *change* in speed over time. Negative acceleration doesn't mean the object is moving backwards, just that its speed is decreasing.
