Example:
To find the Acceleration of an object divide the change in velocity by the time taken for the change
Acceleration = velocity / time

If a Formula 1 cars starting velocity is 0m/s (metres per second)
And its final velocity is 27m/s
The difference is 27m/s
If this change happened in 3seconds
Acceleration = 27 / 3
Acceleration = 9m/s/s