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Why do we need momentum to move through space but not time?

  1. Sep 1, 2015 #1
    I know object need energy to move through space or time (rest energy) but what about momentum?
     
  2. jcsd
  3. Sep 1, 2015 #2

    Nugatory

    User Avatar

    Staff: Mentor

    Google for "four-momentum".
     
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