Question: A physics student driving a 1 2 0 0 - kgkg car runs into the rear of a 2 0 0 0 - kgkg car

A physics student driving a 1200-kgkg car runs into the rear of a 2000-kgkg car stopped at a red light. From the fact that the joined vehicles skidded forward 4.0 mm, the investigating police officer calculates that the speed after the collision was 6.6 m/sm/s .

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