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a railroad car that weight 20,000 lb is traveling eastward with a velocity whose magnitude is 5fps.

a railroad car that weight 20,000 lb is traveling eastward with a velocity whose magnitude is 5fps. a second car, on the same track, that weight 40,000 lb is also traveling in an easterly direction with a velocity of 7.81 fps. when the cars collided, they become coupled together and then both car move with the same velocity. if friction between the cars and the rail is neglected, what were the magnitude and the direction of the velocity of the cars after the collision.

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