Here's why:
* Acceleration is the rate of change of velocity.
* Constant acceleration means the velocity changes by the same amount over equal time intervals.
Negative acceleration simply indicates that the velocity is decreasing. The key is that the *rate* at which the velocity decreases remains constant.
Example:
Imagine a car slowing down at a constant rate. This is negative acceleration. Even though the car is slowing down, the *rate* of slowing down remains the same.
In summary:
* Negative acceleration means the object is slowing down.
* Constant acceleration means the velocity changes by the same amount over equal time intervals.
* Negative acceleration can still be constant acceleration.
