On an icy road a 1600 kg car moving at 53 kmh strikes a 470, Ask an Expert

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On an icy road, a 1600 kg car moving at 53 km/h strikes a 470 kg truck moving in the same direction at 27km/h . The pair is soon hit from behind by a 2100 kg car speeding at 55 km/h , and all three vehicles stick together. Find the speed of the wreckage.

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