The escape velocity of a body from the surface of the earth is 11.2 km/s. If a satellite were to orbit close to the surface, what would be its critical velocity ?

Explanation

`because" "v_(e)=11.2" km"//"s",h~~0`
also, `" "v_(e)=sqrt(2)v_(c)`
`implies" "v_(c)=(11.2)/(sqrt(2))`
`implies" "=7.92" km"//"s"`