Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1400 kg and is approaching at 7.5 m/s due south. The second car has a mass of 550 kg and is approaching at 15.5 m/s due west. Calculate the magnitude of the final velocity, in m/s, of the cars, and determine their direction, in degrees south of west. Finally, determine the change in kinetic energy for the collision in joules.

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