Question: A hoodlum throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building, 30.0 m above the ground.

A hoodlum throws a stone vertically downward with an initial speed of 12.0 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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