Speed on impact
It seems to be hitting the ground at 0.08 in the RT video, first appearing about 5 aircraft lengths back at 0.04, assuming that the fainter trailing light is the lit fin, and the ground position comes from the location of the flash on impact. That's only covering about 150m in 4s, so it's not hitting very fast: about 80 knots.
[Added note 18:00UT on 19th: there are subsequent suggestions that the RT video is slowed to 1/4 speed. This seems a bit odd given the pair of strobe flashes seen in the 4s to impact, but strobes can be aliased to the video rate. A quarter speed video would mean a much faster ~320kt almost-vertical impact, that tallies with the reported impact speed from the MAK in post 124.]
Pointing nose down from stationary, a free falling slippery shape will hit the ground from 150m up in just over 5 seconds, although you would see it accelerate.
I would bet that the video is foreshortened, and there's a significant unseen line-of-sight component to the speed in the video.
Caveat: for the Red Wings Tu 204 crash my video time/speed counting was worse than useless.
Last edited by awblain; 19th Nov 2013 at 16:59.