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A remote- sensing satellite of earth rev...

A remote- sensing satellite of earth revolves in a circular orbit at a height of `0.25xx10^6m` above the surface of earth.If earth 's radius is `6.38xx10^6ms^(-2)` then the orbital speed of the satellite is

A

`6.67kms^(-1)`

B

`7.76kms^(-1)`

C

`8.56kms^(-1)`

D

`9.13kms^(-1)`

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