Conceptual Physics (12th Edition)

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

Chapter 4 - Think and Explain - Page 71-72: 64

Answer

Let the boxes float in front of you, then nudge each one. The box that offers the greater resistance to acceleration has more mass, and is filled with sand.
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