Question: A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00 m above. The keys are caught

A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00 m above. The keys are caught 1.50 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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