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A satellite is in a circular orbit round...

A satellite is in a circular orbit round the earth at an altitude R above the earth's surface, where R is the radius of the earth. If g is the acceleration due to gravity on the surface of the earth, the speed of the satellite is

A

`sqrt2Rg`

B

`sqrtRg`

C

`sqrt(Rg//2)`

D

`sqrt(Rg//4)`

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