Acceleration is the rate of change of velocity, not the velocity itself.
* Velocity describes how fast an object is moving *and* in what direction.
* Acceleration describes how the velocity is changing over time.
Here are some scenarios where an accelerated body can have zero velocity:
* An object at the highest point of its trajectory: When you throw a ball straight up, it slows down as it goes up, eventually reaching a point where its velocity is zero for a split second. At that moment, it's still accelerating downwards due to gravity.
* An object changing direction: Imagine a car moving forward, then coming to a stop at a red light. The car is accelerating backward as it slows down, even though its velocity is zero at the moment it comes to a stop.
* Circular motion: An object moving in a circle at a constant speed is constantly accelerating towards the center of the circle. This is called centripetal acceleration. Even though the object's speed might be constant, its velocity is always changing because its direction is constantly changing.
Key takeaway:
The key point is that acceleration is about the *change* in velocity, not the velocity itself. A body can be accelerating even if it's momentarily at rest.
