Aardvark

the pressure exerted by his/her fall.

the transfer of energy from the moving object to the stationary ground creates the situation that would kill the occupants.

Well, they're in free fall during the fall, which shouldn't hurt them unless they flail about while it's going on. If there's some resistance to falling, then they're not in free fall but rather in decreased gravity and might save themselves by lying on the floor of the elevator with something soft underneath their heads (just a guess there). When the car hits the bottom, their bodies are forced to decelerate from whatever speed they've reached to zero in less than a second. Since their bodies are not rigid -- some parts, including limbs and internal organs, can move relative to each other during deceleration -- there are various fatal injuries that could occur depending on exactly how they hit. I'm not a doctor, but I'm guessing that broken necks, fractured skulls, closed-head injuries, and aortic (or other major arterial) dissections resulting from shear forces within the body, could all lead to death pretty quickly.

the acceleration when it hits the ground kills people. people can withstand no more than 10g on the vertical axis, however the acceleration on impact is much higher than this threshold.