The escape velocity of an object on a planet whose g value is 9 times on earth and whose radius is 4 times that of earth in km/s is
(a) 67.2 (b) 33.6
(c) 16.8 (d) 25.2
Answer: a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a