Terminal velocity
Terminal velocity is the highest velocity attainable by an object as it falls through a fluid.

In order for a  starship to achieve liftoff from a planet's surface, it needed to achieve terminal velocity to get the stabilizers to provide lift. In 2263 of the alternate reality, the crew of the  dropped the  off of a cliff on Altamid in order to launch the ship. The Franklin reached terminal velocity moments before it would have crashed and successfully achieved liftoff. ()

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Measurements
Physics