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Two satellites S(1) and S(2) are revolvi...

Two satellites `S_(1)` and `S_(2)` are revolving round a planet in coplanar and concentric circular orbit of radii `R_(1)` and `R_(2)` in te same direction respectively. Their respective periods of revolution are 1 hr and 8 hr. the radius of the orbit of satellite `S_(1)` is equal to `10^(4)`km. Find the relative speed in kmph when they are closest.

A

`pixx10^(4)" km h"^(-1)`

B

`(pi)/(2)xx10^(4)" km h"^(-1)`

C

`(3pi)/(2)xx10^(4)" km h"^(-1)`

D

`2pixx10^(4)" km h"^(-1)`

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The correct Answer is:
A
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