```

a = (v_f - v_i) / t

```

Where:

* a = acceleration in meters per second squared (m/s²)

* v_f = final velocity in meters per second (m/s)

* v_i = initial velocity in meters per second (m/s)

* t = time in seconds (s)

So, to calculate acceleration, you need to know the final velocity, the initial velocity, and the time.