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Two satellite S(1) and S(2) revolve roun...

Two satellite `S_(1) and S_(2)` revolve round a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1hr and 8hours respectively. The radius of the orbit of `S_(1) is 10^(4)km`. When `S_(2)` is closet to `S_(1)` (i) the speed `S_(2)` relative to `S_(1)` as actually observed by an astronaut in `S_(1)`.

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