If the rate of increase of velocity of a moving body in a particular direction constant all the time, then the acceleration is said to be uniform. Due to gravity, the acceleration of a freely falling body is 9.8 ms-2, that is, its velocity increases by 9.8 ms-2 for each successive second.
Freefall is a special case of motion with constant acceleration because acceleration due to gravity is always constant and downward. This is true even when an object is thrown upward or has zero velocity. Therefore, acceleration of freely falling body is not absolutely uniform, it’s rather constant, due to the acceleration due to gravity.
So, the acceleration of a falling body is uniform.
