This is because flightradar24 measures ground speed. A rock dropped from a building has a ground speed of zero. The apparent recovery was due to the fact that t

This is because flightradar24 measures ground speed. A rock dropped from a building has a ground speed of zero. The apparent recovery was due to the fact that the aerodynamics of a 737 in a nosedive force it to pitch up somewhat. But the pilot probably pushed it back down.