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Two artificial satellites A and B are at...

Two artificial satellites A and B are at a distance `r_(A)` and `r_(B)` above the earth's surface. If the radius of earth is R, then the ratio of their speed will be :-

A

`((r_(B)+R)/(r_(A)+R))^(½)`

B

`((r_(B)+R)/(r_(A)+R))^(2)`

C

`(r_(B)/r_(A))^(2)`

D

`(r_(B)/r_(A))^(½)`

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A
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