Final answer:
Terminal velocity is reached when the upward drag force equals the downward force of gravity, resulting in a constant velocity descent for falling bodies.
Explanation:
Terminal velocity is acquired by a falling body when the upward drag force equals the downward force of gravity. This balance of forces causes the net force on the object to be zero, leading to a constant velocity descent. The value of the terminal speed is determined by factors like viscosity of the fluid, density of the object, and object size.
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