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Homework Help: Numerical Problem

  1. Jul 13, 2016 #1
    A Proton Of Mass 1.67*10^-27kg And Charge 1.6*10^-19c Moving At An Initial Speed 3*10^6m/s Against A Uniform Electric Field Has Its Speed Reduced By 50% After Covering A Distance Of 1.0cm In The Field. Determine The Strength Of The Field? help me solve this problem what formula should i use to solve it.
  2. jcsd
  3. Jul 13, 2016 #2
    Newton's Second Law of Motion
  4. Jul 13, 2016 #3


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    The work-energy theorem can be used also to solve this.
  5. Jul 13, 2016 #4
    can't we use F=K[q1][q2]/r^2 ?
  6. Jul 13, 2016 #5
    I think it's easier to use work-energy theorem
  7. Jul 14, 2016 #6
    i will try this also Thank you :)
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