Terminal velocity is reached by a falling object, not reacted. It's a state where the object stops accelerating due to the balance of forces acting upon it. Here's a breakdown:

* What is terminal velocity? Terminal velocity is the constant speed that a freely falling object eventually reaches when the force of air resistance equals the force of gravity.

* How is it reached? As an object falls, its speed increases. This increase in speed causes the force of air resistance to increase as well. Eventually, the force of air resistance becomes equal to the force of gravity, and the object stops accelerating. At this point, the object has reached its terminal velocity.

Important Note: Terminal velocity is not a fixed value for all objects. It depends on several factors, including:

* Object's shape: A more streamlined object experiences less air resistance and thus has a higher terminal velocity.

* Object's mass: A heavier object experiences a stronger gravitational force, but it also experiences more air resistance, so the effect on terminal velocity is complex.

* Density of the medium: Terminal velocity is different in different mediums (like air, water). A heavier medium will result in a lower terminal velocity.

Let me know if you have any other questions about terminal velocity!