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Two planets of radii in the ratio 2 : 3 are made from the material of density in the ratio 3 : 2. Then the ratio of acceleration due to gravity  g1/g2  at the surface of the two planets will be

(a)      1                                     (b)      2.25

(c)   4/9                                     (d)  0.12

Answer:  a

(6)

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