Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 6 - Dynamics I: Motion Along a Line - Exercises and Problems - Page 165: 66

Answer

No

Work Step by Step

let $t_1$ be the time taken by the cat to leap through window and $t_2$ be time taken by dog to reach the window. for cat $ s= ut _1+\frac{1}{2} at_1^2$ $1.5 = 0 + \frac{1}{2} (0.85)t_1^2$ $t_2 =3.53s^2$ $t_1 = 1.88s$ for dog $ s= ut_2 +\frac{1}{2} at_2^2$ $3 = 1.5t_2 -\frac{1}{2} (0.1)t_2^2$ $t_2^2 -30t_2 +60 =0$ $ t_2 =2.15s$ since $t_2 >t_1$ so dog will no catch cat.
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