* Velocity is a measure of how fast an object is moving and in what direction. Zero velocity means the object is stationary.

* Acceleration is the rate of change of velocity. This means acceleration tells us how the velocity is changing over time.

Example:

Imagine a ball sitting at the top of a ramp.

* At the moment the ball is released, its velocity is zero (it's not moving).

* As soon as the ball starts rolling down the ramp, it gains velocity. This means it has a non-zero acceleration.

So, the ball has zero velocity at the moment it's released, but it has non-zero acceleration because its velocity is changing.

Other Examples:

* A ball thrown straight up in the air: At the very top of its trajectory, the ball momentarily has zero velocity (it stops moving upwards before falling back down), but it still has acceleration due to gravity pulling it downward.

* A car at a red light: The car is stationary (zero velocity), but when the light turns green, the driver accelerates the car, giving it a non-zero acceleration.

Key takeaway: An object can have zero velocity and non-zero acceleration when it's changing its velocity from rest to movement (or vice versa).