A hoodlum throws a stone vertically downward with an initial speed of 12.0 m/s from the roof

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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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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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