The critical velocity of a satellite, orbiting around the earth at a height equal to radius of the earth is,, (R) = 6400 km,`(G=6.67xx10^-11Nm^2//kg^2,M=6xx10^24kg)`

Options

A. a)`7.9m//s`
B. b)`7.9km//s`
C. c)`7.9mm//s`
D. d)`7.9cm//s`

Answer

B