You have two identical cars, both of mass 1,542 kg. The first one is moving to the left with an initial speed of 11.9 m/s, and the second one is moving to the right with a speed of 10.0 m/s. Adopt a coordinate system where rightward is positive. After they collide, they stick together. What is their final velocity (in m/s)? If your velocity is negative, leave the sign on the answer.
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