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Question: The mean diameters of X and Y, two planets in the same solar system, are 6.4 x 10^{3} km and 1.2 x 10^{4} km, respectively. The mass of X is 0.25 times the mass of Y. The value of g on Y is 8.8 m/s^{2}. The mass of Y is 4.750 x 10^{24 }kg. What is the escape speed on X?