Having a background in investigations including plane crashes, I can tell you that the only way a plane with that kind of technology nosedives into the ground, is because someone intentionally made it happen. Most likely pilot murder/suicide. Less likely, foul play. Either way, somebody physically manipulated that plane into a nosedive, and held it there until the end.
That's my guess too. Planes just fall out of the sky.
No, there isn't. You just need a 5 second search on google to fact-check it [video inside of falling plane].
That obviously doesn't exist. If you have ever turned on cellphone while in flight at 30000 feet you won't get a signal. If you did get a signal you lose it immediately because that cell tower your phone connected with is quickly too far away. No one is sending a streaming video out during such a fall.
Roller coasters have seatbelts and massive body constraints. Roller coaster riders whose constraints come loss get thrown out of the ride. Your g-calculation is like assuming that cellphone tower data can determine what happens to people inside of a wreck.
You are correct that cellphone tracking data does not have the time resolution to understand a wreck event. But I am not using the ADSB data to understand the crash itself - just the period before the crash, because the OP said
A plane dropping at high speed, nose first, is not going to have anyone staying in their seats. They would all be pulled out and crushed in the back as a mass. Most of them were gone before the plane hit the ground.
The time resolution of the ADSB data is probably sufficient to give a reasonable estimate of forces experienced by the plane and its occupants before the crash, if this was a pilot-driven crash or a flight control problem (jackscrew, etc.). If this was a violent wind shear event, then the ADSB data will not have the time resolution needed, but I don't see people giving wind shear a high likelihood. Two, four, six g does not crush people. Astronauts exposed to 3g during shuttle launches remained fully functional, including John Glenn at age 77. Accelerations were up to 6-7 g on earlier launch vehicles.
The peak out-of-the-seat acceleration inferred from ADSB data is -0.1g, which is disturbing, but relatively modest compared to the +1.0g in which we live. The peak acceleration of +2.0g was down into the seats, during the brief partial pull-out. Don't take my word for it - calculate with the data here. Even if the peak accelerations were double or triple the 2g's inferred from the ADSB data, that is not enough to "all be pulled out and crushed", or cause them to black out or be "gone before the plane hit the ground". Although that might have been preferable, for those poor souls, may they rest in peace.
The time resolution of the ADSB data is probably sufficient to give a reasonable estimate of forces experienced by the plane and its occupants before the crash.
No. Fuzzy data based on a few external movement data points reveals nothing about what is happening inside in real-time.