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The escape speed of a body on the earth'...

The escape speed of a body on the earth's surface is `11.2kms^(-1)`. A body is projected with thrice of this speed. The speed of the body when it escape the gravitational pull of earth is

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`upsilon' = sqrt(upsilon^(2) - upsilon_(e))^(2) = sqrt((2 upsilon_(e)^(2)) - upsilon_(e)^(2))`
`= sqrt(3) upsilon_(e) = sqrt(3) xx 11.2 = 19.4 km//s`
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