With what initial velocity were the keys thrown


A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.10 m above. The keys are caught 1.40 s later by the sister's outstretched hand.

(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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Physics: With what initial velocity were the keys thrown
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