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4. (10 points) A car with a mass of 1200 kg and traveling 40 m/s east runs into the back of a parked truck

4. (10 points) A car with a mass of 1200 kg and traveling 40 m/s east runs into the back of a parked truck with a mass of 2000 kg. After the collision the car and truck do not stick together, but the car is stopped. If momentum is conserved, what would the velocity of the truck be after the collision?

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