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Q.

The escape velocity on earth is 11.2 km/s. On another planet having twice radius and 8 times mass of the earth, the escape velocity will be

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a

43.2 km/s

b

11.2 km/s

c

3.7 km/s

d

22.4 km/s

answer is C.

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Detailed Solution

vpve=MpMe×ReRp=8×12=2

∴vp=2×ve=22.4 km/s

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