superman 1d problem

A student determined to test the law of gravity for himself walks off a skyscraper 320m high with a stopwatch in hand and starts his free fall.(0 intial velocity). 5 seconds later, superman arrives at the scene and dives off the roof to save the student.What must be supermans initial velocity in order that he catches the student just before reaching the ground? g=10m/s^2

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