A student determine to test the law of gravity for himself walks off a skyscraper 300m high, stopwatch in hand and starts his free fall (zero initial velocity). Five seconds later, Superman arrives at the scene and dives off the roof to save the student. What must Superman’s initial velocity be in order that he catch the student just before the ground is reach? (Assume that Superman’s acceleration is that of any freely falling body).

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Q: catching it?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!