University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 6 - Work and Kinetic Energy - Problems - Discussion Questions - Page 194: Q6.11


The velocities are all different, but the kinetic energies are all the same.

Work Step by Step

Velocity is a vector that indicates both an object’s speed and its direction. The 3 objects are moving at the same speed of 5 m/s, but their directions differ, so they do not possess the same velocity. We know that kinetic energy is $K=\frac{1}{2}mv^2$. The 3 objects have the same mass and the same speed, so they each have the same kinetic energy of 18.75 J. Kinetic energy is a scalar, and the direction of the velocity doesn’t affect it.
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.