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Q. A space vehicle is travelling at 5200 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 77.00 km/h relative to the command module. The mass of the motor is four times the mass of the module. What is the speed of the command module relative to Earth after separation?

Q. A box is placed on a conveyor belt that moves with a constant speed of 1.05. The coefficient of kinetic friction between box and belt is 0.80. How much time does it take for the box to stop sliding relative to belt?

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