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a 1.0 x 103 kg toyota collides into the rear end of a 2.2 x 103...

a 1.0 x 103 kg toyota collides into the rear end of a 2.2 x 103 kg cadillac stopped as a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.8 m before stopping. The police officer,knowing that the coefficient of kinetic friction between the tires and the road was .4 calculated the speed of the toyota at impact. What was that speed? Please show the steps that got you to the answer as that is what I am interested in! thanks

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