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A space vehicle is traveling at 4150 km/h relative to Earth when the exhausted rocket motor...

A space vehicle is traveling at 4150 km/h relative to Earth when the exhausted rocket motor is disengaged and sent backward. The relative speed between the motor and the command module is then 83 km/h. The mass of the motor is four times the mass of the module. What is the speed of the command module relative to Earth just after the separation?

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