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A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.40 m above. The brother's outstretched hand catches the keys 1.30 s later.
(a) With what initial velocity were the keys thrown? (b) What was the velocity of the keys just before they were caught?(Take upward as the positive direction.)
does sodium sulfate contain both ionic and covalent bonds
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give applications of resonance
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