mechanics

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Two planets, X and Y , travel counterclockwise in circular orbits about a star, as shown in
figure below. The radii of their orbits are in the ratio 3 : 1. At some time, they are aligned as in the
figure, making a straight line with the star. During the next five years, the angular displacement of
planet X is 
2 , as shown in figure. Where is planet Y at this time?
3

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