Reddit mentions of Forensic Pathology of Trauma (Forensic Science and Medicine)

According to the textbook Forensic Pathology of Trauma,

>For adults, falls from at least 5 stories to a hard surface are frequently fatal, although survival is possible up to 8 stories. A study of children hospitalized after falls showed that all who fell 3 stories or less survived.

>Although the force:area ratio is high in a feet-first impact, this landing position is usually associated with less injury. Head-first impacts are most likely to be fatal.

There's a whole other section that goes into details of injury patterns. Basically, head-first falls cause head injuries, butt falls causes spinal trauma (and can actually cause the spine to 'poke' into the brain), falls to the side cause broken ribs and tears to organs and vessels, and feet-first falls cause lots of leg fractures, spinal fractures, and lots of tears to organs and vessels.