A bumper car with mass m1 = 107 kg is moving to the right with a velocity of v1 = 4.6 m/s. A second bumper car with mass m2 = 99 kg is moving to the left with a velocity of v2 = -3.5 m/s. The two cars have an elastic collision. Assume the surface is frictionless. What is the final velocity of car 2 in the ground (original) reference frame?