a = (v_f - v_i) / t

Where:

* a is acceleration

* v_f is final velocity

* v_i is initial velocity

* t is time

Explanation:

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

* Final velocity is the velocity of the object at the end of the time interval.

* Initial velocity is the velocity of the object at the beginning of the time interval.

* Time is the duration over which the change in velocity 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 starts from rest (v_i = 0 m/s) and reaches a final velocity of 20 m/s in 5 seconds, then its acceleration can be calculated as:

a = (20 m/s - 0 m/s) / 5 s = 4 m/s²

This means the car is accelerating at a rate of 4 meters per second squared.