Answer:
Mathematically, the acceleration of a body at any time is the second derivative of the position:

In addition, it can be obtained by deriving the speed of the body:

Step-by-step explanation:
In classical mechanics acceleration is defined as the variation of speed with respect to time:

In Newtonian mechanics, for a body with constant mass, the acceleration of the body measured by an inertial observer is proportional to the force acting on it:
