Conceptual Physics (12th Edition)

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

Chapter 5 - Think and Explain: 56

Answer

By symmetry, the forces on each are the same in magnitude. There is nothing to distinguish right from left. Their masses are the same, their accelerations are the same, and they will slide equal distances of 6 m before they meet in the middle.
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