Escape Speed: 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.
Answer: E
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