### Find the speed of the joined cars after the collision

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Two cars, both of mass m, collide and stick together. Prior to the collision, one car had been traveling north at speed 2v, while the second was traveling at speed v at an angle ? south of east (as indicated in the figure). After the collision, the two-car system travels at speed vfinal at an angle ? east of north.

Question: Find the speed vfinal of the joined cars after the collision.

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