* Velocity is a measure of both speed and direction.

* Acceleration is the rate of change of velocity.

Scenario: Imagine a ball thrown straight up in the air.

* At the very peak of its trajectory, the ball has zero velocity. It momentarily stops before falling back down.

* However, the ball is still accelerating due to gravity. Gravity constantly pulls the ball downwards, causing it to change its velocity.

Other Examples:

* A car at a red light: The car is stopped (zero velocity), but it's accelerating when the driver presses the gas pedal.

* A ball on a spring: When the ball reaches its maximum displacement, it has zero velocity, but the spring is pulling on it, causing it to accelerate back towards the equilibrium point.

Key Takeaway: An object can have zero velocity but still be accelerating if there is a force acting on it to change its velocity.