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It just hits the ground with an audible "flop" sound,
and then stays there in a heap, with no rebound.

It accelerates under the force of gravity, without being slowed down by air resistance.

On Earth, our gravitational constant is 9.8 meters per second, per second, or 32 feet per second, per second. This means that anything dropped freely from rest (that is, not thrown) will accelerate from zero to 32 feet per second in the first second, and will accelerate to 64 feet per second after two seconds, and to 96 feet per second after the 3rd second. In the absence of any air, it would continue to accelerate at this rate. But Earth DOES have air, and the air slows down the rate of fall. This depends on the density and shape of the object, so a round rock falls much faster than a feather - because the feather catches the air and slows down, while a rock does not, much.

The Apollo astronauts even did a TV demonstration of this, dropping a hammer and a feather from the same height, and they both hit the Moon's surface together.

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10y ago

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