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8. Centripetal Forces & Gravitation - Part 3 of 3
8. Centripetal Forces & Gravitation / Escape Velocity / Problem 8

It is known that, the minimum velocity required by a spaceship to leave planet X is four times that needed to leave planet Y. Given that both planets X and Y have the same mass, calculate the ratio of the radius of planet X to that of planet Y (rx / ry).

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