A 2000kg car travelling at 10.0m/s collides with a 3000kg car that is initially a rest at a stoplight. The cars stick together and move 2.00m before friction cause them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and all wheels of both cars lock at the time of impact

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!