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The acceleration of an object that falls from a certain height does not depend on its mass, in an ideal condition with no air resistance.

The value of acceleration is the acceleration due to gravity, which is 9.81 m s-2.

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However, in this case, air resistance is going to matter. 12000 feet is high enough for the person to accelerate to what we call terminal velocity. Terminal velocity is the velocity where the force of acceleration due to gravity (9.81 m s-2) is matched by the air resistance. That velocity varies, depending on the outline shape of the person, and is typically around 200 km/h or 125 mph. That will be the velocity of the fall.

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14y ago

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