Escape velocity of an atmospheric particle which is \( 1000 \mathrm...

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Escape velocity of an atmospheric particle which is \( 1000 \mathrm{~km} \) above the earth's surface, is (radius of earth is \( 6400 \mathrm{~km} \) and \( g=9.8 \mathrm{~m} / \mathrm{s}^{2} \) )
(1) \( 6.5 \mathrm{~km} / \mathrm{s} \)
(2) \( 8 \mathrm{~km} / \mathrm{s} \)
(3) \( 10 \mathrm{~km} / \mathrm{s} \)
(4) \( 11.2 \mathrm{~km} / \mathrm{s} \)
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