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Ofcourse, the other factor that has been overlooked is that I suspect that the curvature of the outside of the Eiffel tower, being that it is much wider at the base than at the top, would probably make it very difficult to hit somebody on the ground with something dropped from the top.
Here are the pertinent figures. I'll leave it to someone who knows how to calculate what kind of damage it could do.Terminal velocity - 24-75mph depending on the coin's orientation during descent.Weight - 7.12gThickness - 1.85mm
it would also depend on how it fell,if it tumbles then its velocity would be quite slow compared toedge on.
On a long drop, would a tumbling coin not be "braked" into falling straight on (oriented vertically) just to reduce drag ? Or would the drag force it into a horizontal orientation ?