a = (v_f - v_i) / t

Where:

* a is acceleration

* v_f is the final velocity

* v_i is the initial velocity

* t is the time taken

Explanation:

This formula essentially calculates the change in velocity (v_f - v_i) over a given time interval (t).

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).

Other Formulae:

There are other ways to calculate acceleration, depending on the information available:

* a = F / m (Acceleration due to a force)

* a = g (Acceleration due to gravity)

Example:

A car starts from rest (v_i = 0 m/s) and reaches a speed of 20 m/s in 5 seconds. What is the car's acceleration?

Using the formula:

a = (20 m/s - 0 m/s) / 5 s = 4 m/s²

Therefore, the car's acceleration is 4 m/s².