Answer
Carbon.
Work Step by Step
$KE = \frac{1}{2}mv^{2}$. The higher-mass C atom has greater KE than the H atom moving at the same speed.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 11 - Think and Explain - Page 224-225: 56
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