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Newton is going to attempt to kill Einstein by chopping him into pieces using the Newtonian Blades Death. The blades are separated by 1m and fall instantly and simultaneously. Einstein is 2m tall and flies from left to right under the blades. Newton standing next to the leftmost blade, pulls the lever at the moment that Einstein's foot just passes the leftmost blade, thinking that this will position the right blade in the center of Einstein and will cut him in two.

How fast does Einstein have to fly to not be chopped by the by the blades?

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