Question: A student throws a key chain vertically upwards to her sister in the girls' club. Students, which is in a window 4 m above. Keys

  1. A student throws a key chain vertically upwards to her sister in the girls' club. Students, which is in a window 4 m above. Keys are trapped 1.5 sec. later for his sister's outstretched arm. (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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