Chapter 2, Problem 60AP

A student throws a set of keys vertically upward to his fraternity brother, who is in a window a distance h above. The brother’s outstretched hand catches the keys on their way up a time t later, (a) With what initial velocity were the keys thrown? (b) What was the velocity of the keys just before they were caught? (Answers should be in terms of h, g, and t.)