Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 7 - Linear Momentum - Misconceptual Questions: 2

Answer

Choice B.

Work Step by Step

Though the sand is dropped onto the boat vertically, it does affect the boat’s horizontal motion. Initially the sand’s horizontal velocity is zero. It must be accelerated from rest to the final horizontal velocity of the boat. There is a force between the boat deck and the sandbag, pushing the bag forward. By Newton’s third law, the boat feels an equal but opposite force from the sand, directed backward, and this causes the boat speed to decrease.
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