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Linear Momentum and Collisions Question on Rowboats

Two people, one of mass 70 kg and the other of mass 60 kg, sit in a rowboat of mass 80 kg. With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat, 3.0 m apart from each other, exchange seats. How far will the boat move?

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Let the origin be the center of the boat. Originally, the center of ...

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This solution is comprised of the simple calculations necessary to find this answer.