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The earth is assumed to be a sphere of r...

The earth is assumed to be a sphere of raduis `R`. A plateform is arranged at a height `R` from the surface of the `fv_(e)`, where `v_(e)` is its escape velocity form the surface of the earth. The value of `f` is

A

`1/sqrt2`

B

`1/3`

C

`1/2`

D

`sqrt2`

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