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What will be the escape speed from a pla...

What will be the escape speed from a planet having radius thrice that of earth and the same mean density as that of the earth ? (Take `v_(e)=11.2` km/s)

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The correct Answer is:
33.6 km/s
Hint `v=sqrt((2G(4)/(3)pi R^(3)rho)/(R ))`
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