A student throws a set of keys vertically upward to his fraternity brother, who is in a window 3.90 m above. The brother's outstretched hand catches the keys 1.20 s later. (Take upward as the positive direction. Indicate the direction with the sign of your answer) (a) With what initial velocity were the keys thrown? m/s (b) What was the velocity of the keys just before they were caught? m/s

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