A remote - sensing satellite of earth re...

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