Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Think and Discuss: 104

Answer

If the kinetic energies are the same, the smaller-mass Ping-Pong ball has greater speed than the golf ball.

Work Step by Step

$$\frac{1}{2}m_{small} V_{big}^{2} = \frac{1}{2}M_{big} v_{small}^{2}$$ The same statement can be made for gas molecules that possess the same average KE; lighter ones move faster (on average) than massive ones.
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