Find the speed of the command module relative to earth

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Q. A space vehicle is traveling at 5400 km/h relative to Earth while the exhausted rocket motor is disengaged and sent backward with the speed of 81 km/h relative to the command module. The mass of the motor is four times the mass of the module. What is the speed (in km/h) of the command module relative to Earth just after separation?

Reference no: EM1389163

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