College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Review & Synthesis: Chapters 1-5 - MCAT Review - Page 195: 7


The correct answer is: $A. 4.5~s$

Work Step by Step

We can find the time it takes the rock to fall $100~m$: $y = \frac{1}{2}at^2$ $t = \sqrt{\frac{2y}{a}}$ $t = \sqrt{\frac{(2)(100~m)}{10~m/s^2}}$ $t = 4.5~s$ The correct answer is: $A. 4.5~s$
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