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Q.

If the radius of a planet is four times that of earth and the value of g is same for both, the escape velocity on the planet will be

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a

11.2  km/s

b

5.6  km/s

c

22.4  km/s

d

None

answer is C.

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Detailed Solution

v=2gR⇒vpve=gpge×RpRe=1×4=2⇒vp=2×ve=2×11.2=22.4km/s
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