Posted by **Anonymous** on Sunday, January 29, 2012 at 4:52pm.

A railroad car that weighs 20,000 lb is traveling eastward with a

velocity whose magnitude is 5fps. A second car, on the same track, that

weighs 40,000 lbs also traveling in an easterly direction with a

velocity of 7.8fps. When the cars collided, they became coupled together

and then both cars moved with the same velocity. If friction between the

cars and the rails is neglected, what were the magnitude and the

direction of the velocity of the car after the collision?

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