The terminal velocity of an object falling towards the ground is the speed at which the gravitational force pulling it downwards is equal and opposite to the atmospheric drag (also called air resistance) pushing it upwards. At this speed, the object ceases to accelerate downwards and begins to fall at constant speed.
For example, the terminal velocity of a skydiver in a normal free fall position with a closed parachute is about 195 km/h (120 mile/h). This speed increases to about 320 km/h (200 M/h) if the skydiver pulls in his limbs ...
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posted by NickDouglas at 11:29 AM on December 29, 2004