As air density increases, the true airspeed of the rock would drastically slow. Check out the video from the RedBull skydive record attempt. At one point, he's well over 700 mph, but by the time he pulls the chute he's down to the expected 110-120 mph. The closer to earth the rock got, the slower it would go. By the time it's down around 10,000 feet, I wouldn't expect it to be going much faster than a skydiver... especially if it didn't have a huge amount energy in the form of mass (inertia). A rock that size would slow pretty quickly when faced with that much drag.
Skydiver captures meteorite on video.
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