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Homework Help: Quick notation question

  1. Sep 17, 2009 #1
    Whats the difference between v0 and vi ?

    I thought they both meant initial velocity but my teacher used them both in the formula sheet he gave us. Here's a example.

    motion equations:

    x = x0 +v0 t +1/2 at^2

    delta x = vi t + 1/2 at^2
  2. jcsd
  3. Sep 17, 2009 #2
    The 0 and i are the indexes of the variables, they are merely there to make it easier to recognize variables if you have several of the same type (for example several velocities). Vo and Vi are both used for initial velocity, so both mean basically the same thing.
  4. Sep 18, 2009 #3


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Yes, v0 and vi both mean initial velocity in these equations.
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