Would jumping from around 300ft onto pavement ensure an immediate death? At that height is there any control of how you would land? Preferably head first. It would be off a balcony.
Prognostic factors in victims of falls from height* : Critical Care Medicine
eased mortality rate in victims of falls from height. Design: Clinical observational study, retrospective for January 1998 to May 1999 and prospective from June 1999 to September 2000. Setting: The study population was drawn from Seine-Saint-Denis, an urban region near Paris with 1.3 million...
journals.lww.com
This study says that above the 5th floor your chances of surviving a fall are low and gets significantly lower with each higher floor, as long as you land on concrete directly and not on your feet.
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