Question

What is terminal velocity?

Answer 1

Terminal velocity is the highest velocity attainable by an object as it falls through a fluid (air is the most common example). It occurs when the sum of the drag force, $F_D$ and the buoyant force, $F_B$ is equal to the downward force of gravity, $F_G$ acting on the object. Since the net force on the object is zero, the object has zero acceleration.