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"A 2000 kg Toyota collides into the rear end of a 3000 kg Cadillac stopped at a red light. The bumpers lock,

the brakes are locked, and the two cars skid forward 10 m before stopping. The police officer, knowing that the coefficient of kinetic friction between the tires and the road is 0.4, calculates the speed of the Toyota at impact. What was that speed?"

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