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Need help with solving for t value and plugging back into equation?

  1. Oct 15, 2012 #1
    1. An electron moving along the x-axis has a position given by x=16*te^-t m, where t is in seconds. How far is the electron from the origin when it momentarily stops?


    2. Relevant equations
    uv=u'v+uv'


    3. The attempt at a solution
    x'=e^-t - t*e^-t
    e^-t - t*e^-t = 0
    -te^-t = -e^-t
    t = 1?
     
  2. jcsd
  3. Oct 15, 2012 #2

    tiny-tim

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    welcome to pf!

    hi itsgabriella! welcome to pf! :smile:

    (try using the X2 button just above the Reply box :wink:)
    yup! :smile:

    what's worrying you about that? :confused:
     
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