Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 2 - Kinematics in One Dimension - Problems - Page 49: 44


a) 34.6 m/s b) 14.4 m/s

Work Step by Step

Let down be the negative direction a) $v=u+at$ $u=v-at$ $u=(15)-(-9.8)(2.0)=34.6\; m/s$ b) $v=u+at$ $v=(34.6)+(-9.8)(5.0)=-14.4\; m/s$ OR, without using the answer from part a $v=u+at$ $v=(15)+(-9.8)(5.0-2.0)=-14.4\; m/s$ Hence, the speed is 14.4 m/s.
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.