Astudent throws a set of keys vertically upward to his fraternity brother, who is in a window 4.35 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? (b) what was the velocity of the keys just before they were caught?
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Astudent throws a set of keys vertically upward to his fraternity brother, who is in a window 4.35 m...
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