Conceptual Physics (12th Edition)

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

Chapter 5 - Think and Discuss - Page 89: 73

Answer

Over time, the mass of the rocket becomes smaller as it burns fuel and expels it. Mass is a measure of how hard it is to accelerate an object.
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