Conceptual Physics (12th Edition)

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

Chapter 6 - Think and Discuss: 95

Answer

If the air were brought to a halt by the sail, the impulse given to the sail would be equal and opposite to the impulse given to the fan. There would be no net impulse on the boat, i.e., no change in momentum.
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