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High in middle.
I think it's this: At that kind of velocity, solids act like liquids. And you know how when you drop water into more water, there is a raised thing in the middle? Basically in the center the forces are all in and it goes up because it's moving in and on the outside things are moving out (and still a little down) and everything gets pushed out with them. And that's enough physics for me today.
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