Find the escape velocity of a body from the earth.
[M (earth ) = ` 6 xx 10^(24) ` kg, R ( earth) = ` 6.4 xx 10^(6) ` m.
G = ` 6.67 xx 10^(-11) N.m^(2)//kg^(2)]`

Explanation

Data : `M=6xx10^(24)kg, R=6.4xx10^(6)m,`
`G=6.67xx10^(-11)N.m^(2)//kg^(2)`
The escape velocity of a body from the earth,
`v_("esc")=sqrt((2GM)/(R))`
`=sqrt((2xx6.67xx10^(-11)N.m^(2)//kg^(2)xx6xx10^(24)kg)/(6.4xx10^(6)m))`
`=1.118xx10^(4)m//s=11.18km//s.`