Since i saw everyone say terminal velocity but noone explain it:
Terminal velocity is the maximum speed at which a given object falls. It is determined by the objects weight and drag coefficient.
The reason is that an object gets accelerated by gravity. While falling, it also experienced drag. However, drag is based on speed aswell. The faster you go, the faster the drag rises. At a certain point the drag and gravitational acceleration are equal and the object cannot fall any faster.
In terms of calculating this, the hard part is figuring out an objects drag coefficient and its actual relevant surface area
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