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Solution: Superman's arch nemesis Lex Luthor pushes Lois Lane horizont...

Question

Superman's arch nemesis Lex Luthor pushes Lois Lane horizontally with a speed of 5 m/s off a 35 m tall building. Superman stands on the ground just below the edge of the rood. Ignore air resistance.

How fast must he run (at constant speed) to catch Lois just before she hits the ground?