A hoodlum throws a stone vertically downward with an initial speed of 12.3 m/s from the roof of a building, 20.0 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?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 7OQ: A student at the top of a building of height h throws one ball upward with a speed of vi and then...
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A hoodlum throws a stone vertically downward with an initial speed of 12.3 m/s from the roof of a building, 20.0 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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