Here's why:

* Velocity: Velocity is a measure of speed and direction.

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

* Constant Acceleration: This means the velocity is changing by the same amount every second. This could be a constant increase (speeding up) or a constant decrease (slowing down).

Examples of Constant Acceleration:

* A car accelerating from a stoplight.

* A ball falling freely under the influence of gravity.

* A rocket taking off.