a = Δv / Δt

Where:

* a is acceleration

* Δv is the change in velocity

* Δt is the change in time

Explanation:

Acceleration is the rate of change of velocity over time. This means it describes how quickly an object's velocity is changing.

* Δv represents the difference between the final velocity and the initial velocity.

* Δt represents the time interval over which the velocity change occurs.

Units:

* Acceleration is typically measured in meters per second squared (m/s²).

* Velocity is measured in meters per second (m/s).

* Time is measured in seconds (s).

Example:

If a car accelerates from rest (0 m/s) to a velocity of 20 m/s in 5 seconds, its acceleration would be:

* a = (20 m/s - 0 m/s) / 5 s

* a = 4 m/s²