A loaded railroad car of mass 6000 kg is rolling to the, Ask an Expert

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A loaded railroad car of mass 6000 kg is rolling to the right at 2.0 m/s when it collides and couples with an empty freight car of mass 3000 kg, rolling to the left on the same track at 3.0 m/s. What is the velocity of the pair after the collision? (let right be positive, left be negative).

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