If the density of a small planet is the same as that of earth, while the radius of the planet is....

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If the density of a small planet is the same as that of earth, while the radius of the planet is 0.2 times that
\( \mathrm{P} \)
of the earth, the gravitational acceleration of the surface of that planet is
(1) \( 0.2 \mathrm{~g} \)
(2) \( 0.4 \mathrm{~g} \)
(3) \( 2 g \)
(4) \( 4 g \)


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