Answered: A 20 kg object has an eastward momentum…

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter9: Linear Momentum And Collisions

Section: Chapter Questions

Problem 10P: The magnitude of the net force exerted in the x direction on a 2.50-kg particle varies in time as...

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A 20 kg object has an eastward momentum of 120 kg m/s. It encounters a westward impulse of 40 N*s. What is the magnitude of the final momentum of the object?

I get 80, but I know that's not right because it's not even one of the answer choices. Can someone explain how to do this?

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That's what I thought too! But the answer choices it gave were 8 m/s, 4 m/s, 2 m/s, and 6 m/s so I'm confused. I went with 8 and it was wrong.

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