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7-22. A link-up is made in space between a passenger mod- ule drifting at a speed of 30 m/s in one direction and an equipment module drifting at a speed of 4.0 m/s in the oppo- site direction. If the mass of the passenger module including passengers) is 380 kg and the mass of the equipment module is 120 kg, what is the speed of the two modules after link-up?
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