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Calculate the escape velocity of a body ...

Calculate the escape velocity of a body from the Earth's surface.

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Radius of earth, R= 6400 km= `6.4xx10^6`m
Mass of earth, M=`6xx10^(24)kg : g=9.8 ms^(-2)`
Escape velocity, `V_e=sqrt(2gR)`
`:. V_e=sqrt(2xx9.8xx6.4xx10^6)=11.2` km/s
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