* Acceleration is a change in velocity. Velocity includes both speed and direction.
* Constant speed doesn't mean constant velocity. If the direction of motion changes, even if the speed stays the same, the velocity changes, and therefore there is acceleration.
Examples:
* Circular Motion: An object moving in a circle at a constant speed is constantly changing direction. This change in direction means it has acceleration, even though its speed is constant.
* Projectile Motion: A ball thrown horizontally will have a constant horizontal speed, but gravity causes it to accelerate downwards.
In summary: Acceleration is about changes in velocity, not just speed. A body can have acceleration even if its speed is constant, as long as its direction of motion changes.
