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Homework Help: How far does the particle travel?

  1. Sep 16, 2008 #1
    1. The problem statement, all variables and given/known data

    A charge of -1.8 µC is fixed in place. From a horizontal distance of 0.0450 m, a particle of mass 2.25 10-3 kg and charge -1.7 µC is fired with an initial speed of 65.0 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero?

    2. Relevant equations

    q(V) = 1/2mv^2 (??)

    3. The attempt at a solution

    I'm afraid I'm very lost on this one. I messed around with the equation for collisions a bit but I can't seem to get in the right direction much less get the answer.

    I would be grateful if you guys could provide me with some hints to get started >.<
  2. jcsd
  3. Sep 17, 2008 #2


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    Welcome to PF!

    Hi hichangkyu! Welcome to PF! :smile:

    Hint: just use KE + PE = constant. :smile:
  4. Sep 23, 2008 #3
    I am having the same problem. I do not get KE + PE = constant?!
  5. Sep 24, 2008 #4


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    Hi nckaytee! :smile:

    KE = 1/2 mv2, and PE = … ? :smile:
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