Planet a Has Twice the Mass of Planet B

Planet A has twice the mass of Planet B.From this information,what can we conclude about the escape speed for Planet A compared to that of Planet B?

A) The escape speed for Planet A must be twice as great as the escape speed from Planet B.
B) The escape speed for Planet A must be four times as great as the escape speed from Planet B.
C) The escape speed for Planet A is the same as the escape speed from Planet B.
D) The escape speed for Planet A is greater than the escape speed from Planet B, but we cannot say how much greater.
E) We cannot conclude anything about the escape speed for Planet A without knowing the radii of the two planets.

Correct Answer:

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