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a 25 kg sports car travelling a t 25 m/s smashes into the rear end of...

a 25 kg sports car travelling a t 25 m/s smashes into the rear end of a second vehicle stopped at a red l light. the bumpers and brakes are locked and the two cars skid forward 4.5 m Before stopping. friction between tires and road ii is .8. calculate the mass of the second vehicle

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