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Terminal Velocity of Giant Drop

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This probably explains it better than me. As you can see, its a pretty complex thing to work out. But basically, if there was no air friction things would keep accelerating at 9.8 ms^-2 until they hit the ground. But in reality air friction causes drag, and the faster you are moving the more drag occurs. When it is falling fast enough the upward drag forces will equal the downward weight force of the object, and since the net force on it is zero it stops accelerating, and just keeps falling at a constant rate instead.

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