Water needs time to move and get out of the way. It doesn’t compress like a spring and dampen your fall, all it does is simply get pushed away from the object entering it.
At a certain height, you’re falling with enough speed that the water simply cannot get out of the way fast enough.
The smaller the surface area hitting the water, the faster said object can enter the water safely because you need to displace less water. So when you belly flop into a pool from the side, it hurts like hell. It’s also why divers can jump with hands or feet first from greater heights and higher speeds and be fine.
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