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 10 - Energy - Exercises and Problems - Page 272: 7


$\frac{v_{son}}{v_{mother}} = 2$

Work Step by Step

Let $m$ be the mass of the son. Let $4m$ be the mass of the mother. We can equate the kinetic energy of the son and the kinetic energy of the mother to find the ratio of their speeds. $KE_{son} = KE_{mother}$ $\frac{1}{2}mv_{son}^2 = \frac{1}{2}(4m)v_{mother}^2$ $\frac{v_{son}^2}{v_{mother}^2} = 4$ $\frac{v_{son}}{v_{mother}} = 2$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.