* Velocity is a measure of an object's speed and direction. Zero velocity means the object is stationary.

* Acceleration is the rate of change of velocity. It describes how quickly an object's velocity is changing.

Example:

Imagine a ball at the top of a ramp.

* At the very instant the ball is released, its velocity is zero. It's not moving yet.

* But, gravity is acting on the ball, causing it to accelerate downwards. This means the ball's velocity is increasing even though it hasn't started moving yet.

In this scenario, the ball has zero velocity (it's not moving) but has a non-zero acceleration (due to gravity).

Other Examples:

* A car at a red light: The car is stationary (zero velocity), but it's accelerating when the light turns green.

* A ball thrown straight up: At the peak of its trajectory, the ball momentarily stops (zero velocity), but it's still accelerating due to gravity.

Key Point: Acceleration is about *change in velocity*, not just velocity itself. An object can be accelerating even if it's momentarily at rest.