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Need help with Momentum and Impulses

  1. Dec 14, 2013 #1
    A .450 kg arm moves horizontally at 7.00 m/s when it strikes a wall and comesto rest after driving the wall 1.00 cm. Calculate the duration of the impact. What was the average force exerted on the nail?

    Delta P = F delta T
    F delta t = m delta v
    F=ma

    I know the momentum would be .315 kgm/s, but i'm not sure how to calculate the rest.
     
  2. jcsd
  3. Dec 14, 2013 #2

    Doc Al

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    Staff: Mentor

    Hint: Assume that the acceleration is constant during the impact.
     
  4. Dec 14, 2013 #3
    check that decimal point!
     
  5. Dec 14, 2013 #4

    Doc Al

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    Staff: Mentor

    Yeah, that too! :smile:
     
  6. Dec 14, 2013 #5

    rude man

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    Homework Helper
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    What does the impulse integral say?
     
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