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A 1.38 × 104 kg railroad car moving at 7.64 m/s to the north collides with...

A 1.38 × 104 kg railroad car moving at 7.64 m/s to the north collides with and sticks to another railroad car of the same mass that is moving in the same direction at 1.94 m/s. What is the velocity of the joined cars after the collision?

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