How fast will a rock fall from 10000 ft?

-- At the beginning, when it's dropped, its speed is zero.

-- At the end, when it hits the ground, its speed is 802.5 feet per second (547.2 mph).

-- During the 24.92 seconds when it's falling, its speed increases smoothly at the rate
of 32.2 feet per second faster every second than it was a second earlier.


These numbers are true if the rock is not falling through air. If there happens to be
air in some or all of its path, then the numbers are somewhat different, and they'd
depend on the shape, size, and weight of the rock. Even knowing those details ...
which you haven't included in the question ... a calculation in advance would be
fiendishly complicated, and the only real way to accurately predict the answer
would be to take the rock up to 10Kft, drop it, and time it.