Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 2 - Describing Motion: Kinematics in One Dimension - General Problems - Page 46: 66


The total time is 5.75 hours and the average speed is 852 km/hr.

Work Step by Step

First, we find: $t_1 = \frac{2100}{720} = 2.92 ~hours$ $t_2 = \frac{2800}{990} = 2.83 ~hours$ Next, The total time is: $t_1+t_2 = 2.92 + 2.83 = 5.75 ~hours$ Therefore, the average speed is $\frac{4900 ~km}{5.75~hours} = 852~km/hr$
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.