2. If one knows that the free-fall acceleration on the moon surface is about 1/6 of that on earth and the density of the moon is about 0.6 of the earth density, what is the closest estimate of the moon radius? You can use 6400 km as the average earth radius.
(A) 1067
(B) 1778
(C) 2304
(D) 3840 [km]

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