You will need
  • To know the rate of movement of the body/object/subject within the given time.
Worth considering example: given uniformly moving body whose velocity at time t1 was V1 and at time t2 velocity of the body was V2. In this case, in order to calculate the acceleration of the body, you can use the formula:
a = (V2-V1)/(t2-t1).
The unit of acceleration in SI system is meter per second squared (m/h?).