Here's why this is the case:
* Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
* Acceleration is the rate of change of velocity. This means acceleration can occur if:
* Speed changes: The object is speeding up or slowing down.
* Direction changes: The object is changing its path, even if its speed remains constant (like a car turning a corner).
* Both speed and direction change: This is the most general case, like a projectile moving through the air.
Therefore, acceleration describes the rate at which an object's velocity changes, regardless of whether the change is in speed, direction, or both.