Acceleration is the rate of change in an object's velocity with respect to time. It is a vector quantity, meaning it has both magnitude and direction. The magnitude of acceleration is measured in meters per second squared (m/s²). The direction of acceleration is the same as the net force acting on the object.

Acceleration can be calculated using the following formula:

$$a = \frac{\Delta v}{\Delta t}$$

where:

* a is the acceleration

* Δv is the change in velocity

* Δt is the change in time

To calculate acceleration, you need to know the velocity of the object at two different times. You then subtract the initial velocity from the final velocity to find the change in velocity. You then divide the change in velocity by the change in time to find the acceleration.

For example, if an object starts at rest and moves with a velocity of 5 m/s after 2 seconds, the acceleration is:

$$a = \frac{5 m/s - 0 m/s}{2 s} = 2.5 m/s²$$

This means that the object's velocity is increasing by 2.5 m/s every second.