A man can jump vertically to a beight of \( 1.5 \mathrm{~m} \) on the earth. Calculate the radiu...

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A man can jump vertically to a beight of \( 1.5 \mathrm{~m} \) 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 \( 6.41 \times 10^{6} \mathrm{~m} \).
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