Ball thrown faster than terminal velocity I recently read about the property of terminal velocity for objects and I got a question when doing so.
If from a very tall building I throw a ball faster than terminal velocity downwards, will the ball slow down, then continue with terminal velocity, or will it continue with the speed I threw it with?
 A: Terminal velocity is achieved when the drag force $f=Dv^2$ (where $D$ is a constant and $v$ is the object's speed) equals the gravitational force $F_g=mg$. Equating these forces is the condition for terminal speed, which is $\displaystyle v_T=\sqrt{\dfrac{mg}{D}}$.
If the ball is thrown with an initial velocity greater than the terminal velocity, then $f>F_g$, so the ball will slow down until $f$ decreases enough such that $f=F_g$, in which case the forces are balanced and terminal velocity is achieved.
A: The ball will slow down to terminal velocity. This is because the force of air drag increases with increasing speed. Terminal velocity is the speed where the force of air drag equals the force of gravity, so the total force is zero and the object travels at a constant speed. If the ball has a higher speed, then it will have an air drag force greater than gravity and slow down.
A: A similar situation occurs when you push hard on a door in between 2 rooms (all other doors and windows are shut) and it slows down until it reaches the terminal velocity.
A: An object with initial velocity greater than it's terminal velocity will decelerate until it finally hits the ground.

