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A planet having mass 9 M e and radius 4R e , where M e and R e are mass and radius of earth respectively, has escape velocity in km/s given by: (Given escape velocity on earth V e = 11.2 × 10 3 m/s)

1. 67.2
2. 16.8
3. 11.2
4. 33.6

Correct answer: 16.8

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