How does air resistance affect the velocity of a falling object

Air resistance is a form of frictional force which opposes motion of falling objects. As the object is falling down with gravitational acceleration, it reduces the speed of the object as it resists its falling motion. Greater the air resistance, lesser the speed of the falling object

When an object free-falls through vacuum (no air) pulled by gravity,

there's no limit to the speed it can reach. It keeps falling faster and

faster until it hits something.

When the object is falling through air, the effect of air resistance

places a limit on the maximum speed it can reach. It falls faster

and faster until it reaches that speed. After that, it stops accelerating,

and falls the rest of the way at a constant speed.