University Physics with Modern Physics (14th Edition)

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

Chapter 7 - Potential Energy and Energy Conservation - Problems - Discussion Questions - Page 228: Q7.11


Statements B and C are true.

Work Step by Step

a. The potential energy is mass multiplied by g multiplied by the initial height (if we let height = 0 at ground level). The 10.0-kg mass has 10 times the initial potential energy of the 1.0-kg mass. b. In the absence of air resistance, the acceleration is $9.8\;\frac{m}{s^2}$ for each object, directed downward. c. Objects undergoing identical accelerations over the same displacement will have the same final speed. d. Kinetic energy is $\frac{1}{2}mv^2$. The 10.0-kg mass has 10 times the final kinetic energy of the 1.0-kg mass, just before they hit the ground. This makes sense, because the heavy mass started with 10 times the PE, and mechanical energy is conserved in this problem (because there is no air resistance).
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.