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2016
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Q)
The ratio of escape velocity at earth $(v_e)$ to the escape velocity at a planet $(v_p)$ whose radius and mean density are twice as that of earth is :
( A ) $1: \sqrt{2}$
( B ) $1 : 2\sqrt{2}$
( C ) $ 1 : 4$
( D ) $1 : 2 $
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