A remote-sensing satellite of earth revo...

A remote-sensing satellite of earth revolves in a circular orbit at a hight of `0.25xx10^(6)m` above the surface of earth. If earth's radius is `6.38xx10^(6)m` and `g=9.8ms^(-2)`, then the orbital speed of the satellite is

6.67 km `s^-1`

7.76 km `s^-1`

8.56 km `s^-1`

9.13 km `s^-1`

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