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from a 90 m cliff a Stone is thrown upward with initial velocity of 65 m/s....

from a 90 m cliff a Stone is thrown upward with initial velocity of 65 m/s. find how long it takes to reach max height. total travel tome from throwing point to ocean surface. velocity of hitting ocean surface. velocity 20 m above ocean surface. at what height above the throwing point is velocity 40 m/s

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