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 tells us how quickly the velocity of an object is changing.

* Final velocity (v_f) is the velocity of the object at the end of the time period.

* Initial velocity (v_i) is the velocity of the object at the beginning of the time period.

* Time (t) is the duration of the time period over which the acceleration is measured.

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:

A car starts from rest (v_i = 0 m/s) and reaches a final velocity of 20 m/s after 5 seconds (t = 5 s). The acceleration of the car can be calculated as:

a = (20 m/s - 0 m/s) / 5 s = 4 m/s²

This means the car's velocity is increasing by 4 meters per second every second.