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Momentum Conservation Graphs

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A cart of mass m moving rightward at speed 2v hits a slower moving cart of mass m moving rightward at speed v. When the carts collide, they hook together. There is friction between the track and carts (and between the moving parts of the carts).
Which of the following best represents the momentum of the left-side cart as a function of time before and after the collision?
Consider rightwards as the positive direction.
Choose 1 answer: