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A man can jump vertically to a height of...

A man can jump vertically to a height of `1.5 m` on the earth. Calculate the radius of a planet of the same mean density as that of the earth from whose gravitational field he could escape by jumping. Radius of earth is `6.41 xx 10^(5) m`.

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The correct Answer is:
`3.1 xx 10 ^(3)m`
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