Dude, I just found your channel through your centrifugal force explanation video and I felt like someone had to say it; You're doing something right in this world!
Freefall is a special case of motion with constant acceleration, because acceleration due to gravity is always constant and downward. ... Since gravity pulls the object toward the earth with a constant acceleration g, the magnitude of velocity decreases as the ball approaches maximum height.
In a vaccum:- the body accelerates in a free fall for 9.8m/s^2. A vacuum has no air-resistance, only gravitational pull acts on it With air:- the body accelerates in a free fall for 9.8m/s^2. However, for larger/less aerodynamic objects eg:- an elephant, air resistance can reduce the acceleration of the object leading to terminal velocity, where both drag and gravitational pull is equal in other words the thing that makes the velocity increase/decrease is air-resistance in a falling object. hope that helped :)
