Question: A hoodlum throws a stone vertically downward with an initial speed of 1 8 . 0 m / s from the roof of a building,

A hoodlum throws a stone vertically downward with an initial speed of 18.0 m/s from the roof of a building, 30.0 m above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of the stone at impact?

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