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A planet has twice the radius but the mean density is 1/4 th  as compared to earth. What is the ratio of escape velocity from earth to that from the planet

A planet has twice the radius but the mean density is 1/4 th  as compared to earth. What is the ratio of escape velocity from earth to that from the planet

(a)      3 : 1                                   (b)  1 : 2

(c)   1 : 1                                    (d)  2 : 1

Answer: c

(7)

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