Conceptual Physics (12th Edition)

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

Chapter 6 - Think and Discuss: 102

Answer

This situation is like the train car that collides with an identical stationary one (see Figure 6.14 on page 99). They stick together and move away with half the initial velocity. $$Mv + 0 = (M+M)(\frac{v}{2})$$ The incoming deuteron shares its momentum equally with the other particle, leading us to conclude that it too is a deuteron.
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