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I like the pragmatic engineering point of view described in the article:

> For engineering purposes, disk fragments are assumed to have infinite energy at the moment of release; they will cut through any reasonable material and cannot be contained.



Also demonstrated by the picture in the op of the brick wall. Note that it wasn't smashed or knocked down, but looks as if it was cut.


That must have been the section that broke downward, so was traveling faster than terminal velocity.




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