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Homework Help: Electric potential energy and work

  1. Sep 15, 2015 #1
    1. The problem statement, all variables and given/known data
    Positive point charge (Q = 8 μC, mass m = 19 g) is fixed at point (9 cm,0). A second identical charge q is constrained to slide on a frictionless wire along the y-axis. Assume: the only force on q is the electrostatic force. If q starts at (0,7 cm) and is released from rest, find its speed when it reaches (0,50 cm), in m/s.

    2. Relevant equations
    △V=W/Q
    W=F*S=Q*E*S

    3. The attempt at a solution
    I attempt to use W=F*S=Q*E*S=1/2*m*vf^2 - 1/2*m*vi^2, but I got wrong.
    thank you for your help
     
  2. jcsd
  3. Sep 16, 2015 #2

    Orodruin

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    You need to provide your actual attempt, this is only a description of what you did and does not contain your actual computations.
     
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