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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 4 - Think and Explain - Page 71-72: 64
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