A van of mass 5500kg is travelling at 6.0 m s-1 and crashes into a car with a mass of 3000 kg which is travelling at 2.0 m s-1 in the same direction as the van. The velocity of the van after the collision is 2.6 m s-1. What is the velocity of the small car after the collision? (Assume the effects of any other external forces are negligible.)

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