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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a