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12. Running on soft dry sand is exhausting, so you switch to running on hard wet sand. The hard wet sand removes less energy from you because

 

  • it pushes up on your foot just as hard as your foot pushes on it, unlike the soft dry sand.
  • it barely moves downward as you push downward on it, so you do almost zero work on it.
  • it stops the downward motion of your foot faster and thus absorbs less of your momentum.
  • it stops the downward motion of your foot faster and thus absorbs more of your momentum.

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