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Homework Help: New value of the particle's total energy?

  1. May 7, 2009 #1
    1. The problem statement, all variables and given/known data

    A charged particle is observed to have a total energy of 0.642 MeV when it is moving at 0.700c. If this particle enters a linear accelerator and its speed is increased to 0.980c, what is the new value of the particle's total energy?

    2. Relevant equations
    Rest mass energy:

    Kinetic energy:

    Total energy:

    3. The attempt at a solution
    I tried to solve for the rest mass energy using the original speed and total energy, but got stuck. I also tried to set up a ratio of old total E on top of new total E, but that didn't give me the correct answer.

    Can anyone help? Thanks!
  2. jcsd
  3. May 7, 2009 #2


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