The acceleration of a falling object is called acceleration due to gravity, and it is approximately 9.8 m/s² on Earth. This means that for every second the object falls, its downward velocity increases by 9.8 meters per second.

However, it's important to note:

* Air resistance: This value of 9.8 m/s² is only true in a vacuum. In reality, air resistance slows down falling objects, meaning they don't actually reach this acceleration.

* Variations in gravity: The acceleration due to gravity is not exactly 9.8 m/s² everywhere on Earth. It varies slightly based on altitude and location.

So, while 9.8 m/s² is a good approximation, it's not a universal constant for all falling objects.