Answered: Train cars are coupled together by…

Train cars are coupled together by being bumped into one another. Suppose two loaded train ca having a mass of 120,000 kg and a velocity of 0.300 m/s, and the second having a mass of 12

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter9: Momentum And Its Conservation

Section: Chapter Questions

Problem 51A

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Concept explainers

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

Question

Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first
having a mass of 120,000 kg and a velocity of 0.300 m/s, and the second having a mass of 125,000 kg and a velocity of -0.120 m/s. (The
minus indicates direction of motion.) What is their final velocity?
m/s
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