Two automobiles approach an intersection.  One vehicle (with mass m) is traveling with velocity 20 m/s toward the east, and the other vehicle (with mass 2m) is traveling north with speed v2.  Neither driver sees the other.  The vehicles collide in the intersection and stick together, leaving parallel skid marks at an angle of 40 degrees north of east. What is the speed v2 of the second vehicle (in m/s)? If mass (m = 1000 kg), how much kinetic energy (in Joules) is lost during the collision?

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A:

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