Drag force, or the force of air friction for a falling body, increases with speed. A falling object will reach a speed at which the force of air friction will be equal to and opposite the force of gravity. At that point, the object will no longer accelerate. It's speed will remain constant, and we call that speed (and direction) its terminal velocity.
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You drag the e next to the dash then drag the envelope at the other side of the dash
Drag is typically minimised where possible, as it has no purpose in making flight simpler, better or more efficient.
2, drag-on
yes
The object accelerates.