The space station is moving towards the center of the Moon at a speed v0 = 2.1 km/s. To carry out a soft landing on the lunar surface, the propulsion system is turned on for a time t = 60 s, emitting a gas jet at a speed u = 2 km/s relative to the station in the direction of the station speed. At the end of braking, the speed decreased to almost zero. How many times did the mass of the station decrease during this time if the braking was carried out near the surface of the Moon, where the acceleration of free fall

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