Two planets P 1 and P 2 with equal mass have radii R 1 and R 2 , respectively, where R 2= R 1 2 . The escape speeds of P 1 and P 2 are v 1 and v 2 , respectively. Then v 2 v 1 is:

1. A. 1 2
2. B. 1
3. C. 2
4. D. 2

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