Here's why:
* Acceleration is the rate of change of velocity.
* Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
* Deceleration is a specific type of acceleration where the velocity is decreasing in magnitude.
Example:
* A car moving at 60 mph and slowing down to 30 mph is experiencing deceleration. This means its acceleration is negative.
Key points:
* Acceleration and deceleration are not opposites. They are simply different directions of change in velocity.
* Deceleration is negative acceleration.
* If velocity is constant, there is no acceleration.
