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Plz help me understand this velocity time graph

  1. Sep 30, 2013 #1
    can u describe this motion? how is x > 0 at E? how can we tell the sign of x from the graph?
     

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  3. Sep 30, 2013 #2

    DrClaude

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    This looks like a harmonic oscillator centered on ##x=0##. In that case, ##a=0## corresponds to ##x=0## and the acceleration is pointing to the left (##a <0##) when the particle is right of ##x=0##. Therefore ##a < 0## means ##x > 0##, which is the case for ##t_\mathrm{E}##.
     
  4. Sep 30, 2013 #3

    Simon Bridge

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    "u" wouldn't, but "you" would describe it by looking at the shape - what shape is it? What class of equations gives that shape?

    x is the displacement - what is the relationship between the displacement and the velocity?
    You cannot actually tell the absolute position of the object just from looking at the v-t graph alone - you can only tell how it changes position.
     
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