A 890 kg sports car collides into the rear end of a 2500 kg SUV stopped at a

I

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red light. The bumpers lock, the? brakes are locked, and the two cars skid forward 3.0 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.80, calculates the speed of the sports car at impact.

- What was that speed?
 
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