Kobe's helicopter was dropping at 2,000 ft per min when it crashed
https://nypost.com/2020/01/28/kobe-bryants-helicopter-dropped-at-2000-feet-per-minute-in-high-energy-crash/
The Sikorsky S-76B chopper lost contact with air-traffic control when it was traveling about 2,300 feet above the ground over the mountains in Calabasas, an NTSB official said at a press conference.
It then started a “steep descent,” dropping at more than 2,000 feet per minute, authorities said.
“We know this was a high-energy-impact crash. The helicopter was in a descending left bank,” the NTSB official said.