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Option 2 : 2

The correct answer is 2

  • Clearly, the context explains the force experienced by woodpecker
  • Here, the concept of preposition is brought under consideration
  • Since 'in to' is used to denote the change of form from one to another
  • 'up to' is used for indicating a maximum amount
  • Thus, we should replace in to with up to
     

Thus the correct sentence is:  A woodpecker hammering away at a tree experiences forces up to 1,400 times that of Earth's gravity, or 1,400 G's. 

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