* Acceleration is the rate of change of velocity. Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
* Rest implies zero velocity. A body at rest has zero speed and is not changing direction.
* If velocity is not changing, acceleration is zero. Since the body is not changing its speed or direction, its velocity is constant, and therefore acceleration is zero.
Example:
Imagine a ball sitting on a table. It's at rest. Even if there are forces acting on the ball (like gravity and the normal force from the table), these forces balance each other out, resulting in a net force of zero. Since there is no net force, there is no acceleration, and the ball remains at rest.
The key point is that for acceleration to occur, there must be a change in velocity. A body at rest, by definition, is not experiencing a change in velocity.
