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How to find the final velocity o

  1. Oct 14, 2015 #1
    The question is:
    a bullet that is shot from a target is travelling at an initial speed of 80 m/s and it is 6 m away from its target. The target is wearing a bullet proof vest that is 0.26 m thick. As the bullet makes contact with the vest is slows down at a rate of 9000 m/s2. What is the final velocity of the equation?


    I would assume that the equation used would be Vf^(2) = Vi^(2) + 2ad, however each time I attempt this question I get an answer that makes absolutely no sense.
    So, please help me,
    Thank you! :)
     
  2. jcsd
  3. Oct 14, 2015 #2
    EDIT: I realized I did the problem and, according to the guidelines, that isn't allowed! So, instead: for the acceleration, is 9000 m/s2 constant for the whole 6.26 m?
     
    Last edited: Oct 14, 2015
  4. Oct 14, 2015 #3

    haruspex

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    how do you expect anyone to tell you where you are going wrong if you do not post your working?
     
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