1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor
    Homework Helper

    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


    User Avatar
    Science Advisor
    Homework Helper

    Hi nckaytee! :smile:

    KE = 1/2 mv2, and PE = … ? :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook