Car A of mass of 1120 kg hits Car B of mass 1420-kg at rest. The two cars lock together and skid 12.0 m on a level surface before stopping. Police determine that the coefficient of kinetic friction between the tires and the road is 0.64. Was the first car exceeding the 45 mph speed limit? This is a two-part problem. Identify the two parts of the problem and the concept used to solve each part. Represent each part in multiple ways (sketches, equations, free-body diagrams, etc.) and find the unknown initial velocity of Car A.

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