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Please revise my answer for me.

  1. Sep 19, 2010 #1
    1. The problem statement, all variables and given/known data
    A car traveling 85km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.80m. What was the average acceleration of the driver during the collision? Express the answer in terms of "g's" where 1.00g = 9.81m/s^2.


    2. Relevant equations

    (85 km/h)(1000m/1km)(1h/3600s)= 23.6m/s

    (vf^2-vi^2)/(2d)=a


    3. The attempt at a solution

    vi=23.61m/s
    d=.80m
    vf=0m/s

    (0^2)-(23.6^2)/(2x.80)= -348.39m/s^2

    -348.39/(9.81)= -35.51g's 35.5g's in the negative direction.

    This does not seem right to me, can anyone confirm or lead me in the right direction, not do the work for me as I know that is frowned upon here =)
     
  2. jcsd
  3. Sep 19, 2010 #2
    Looks right. Thats why accidents suck.
     
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