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A 1055kg van, stopped at a traffic light, is hit directly in the rear by a 715 kg car traveling with a velocity of 2

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A 1055kg van, stopped at a traffic light, is hit directly in the rear by a 715 kg car traveling with a velocity of 2.25 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of (a) the car and )b) the van?