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Q: Why is hitting water from a great height like hitting concrete?
The original question was: I know that if you hit water at a certain speed it is supposed to crush your body like you have hit concrete. The more energy that’s involved in a collision, the less important the binding energy (the energy required to pull a thing apart) is. For example, the difference between water and ice is that the random kinetic energy of water, better known as “heat”, is greater than the binding energy between the molecules in ice. So, when you fall from a great height and land in water there’s a bunch of kinetic energy going every which way. So, in a very, very hand-wavy way, a fast moving body hitting water (or whatever) has a higher Reynolds number, and is more waterish itself.
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