Originally Posted by
physicus
ADS-B data from FR24 gives GPS derived speed, which is the ground speed, i.e. the speed of the aircraft in the horizontal plane only as seen from straight above. If you're tossing a stone off a tower by throwing it away from the tower, it will retain most of the forward velocity but vertical velocity will continue to increase until it hits the ground, thus creating parabolic flight path.
Yes, although the aircraft's trajectory, with at least some thrust being generated, would differ slightly from the purely ballistic trajectory of a thrown stone.
The last few points of the ADS-B data would suggest a flightpath angle approaching -50° and a resolved velocity approaching 400 kts at the last recorded point. That's consistent with the relatively small debris field.