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1. $R = 3.4 \times 10^{6} m,$

A. $5.1 k m s^{- 1}$
B. $5.1 k m s^{- 1}$
C. $5.1 k m s^{- 1}$
D. $5.1 k m s^{- 1}$

Answer: Option A

Explanation:

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