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Homework Help: Energy- protons

  1. Mar 11, 2009 #1
    A proton (m=1.67x10^-27 kg) that has a speed of 5.0x10^6 m/s passes through a metal film of thickness 0.010mm and emerges with a speed of 2.0x10^6 m/s. How large an average force opposed its motion through the film??

    can anybody give me a clue on where i can start?
  2. jcsd
  3. Mar 11, 2009 #2


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    Staff Emeritus
    Science Advisor

    Force, F = mass * acceleration.

    There is an equivalence between energy and force applied over distance.

    If a mass is accelerated uniformly (at an acceleration a) from velocity v1 to velocity v2 over a distance x, what is the relationship between v1, v2, a and x?
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