Which of the following are correct? (1) If \( R \) is the radius of a planet, \( g \) is the acc...

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Which of the following are correct?
(1) If \( R \) is the radius of a planet, \( g \) is the acceleration due to gravity, the mean density of the planet is \( 3 g / 4 \pi G R \).
(2) Acceleration due to gravity is a universal constant.
(3) The escape velocity from a planet which has double the mass of earth and half its radius is \( 22.4 \mathrm{~km} \mathrm{~s}^{-1} \).
(4) The ratio of gravitational mass and inertial mass of a body at the surface of earth is 1 .
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