A space vehicle is traveling at 2820 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 89 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?

Principles of Physics: A Calculus-Based Text
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Chapter8: Momentum And Collisions
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A space vehicle is traveling at 2820 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 89 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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