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Q.

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

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a

67.2

b

33.6

c

16.8

d

25.2

answer is A.

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Detailed Solution

vpve=gpge×RpRe=9×4=6∴vp=6×ve=67.2km/s
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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