A body of mass m is dropped from a heigh...

A body of mass m is dropped from a height nR above the surface of the earth (here R is the radius of the earth). The speed at which the body hits the surface of the earth is

`sqrt((2gR)/n+1)`

`sqrt((2gR)/n-1)`

`sqrt((2gRn)/n-1)`

`sqrt((2gRn)/n+1)`

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