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Bullet Strikes A Block Of Wood

  1. Sep 14, 2006 #1
    A 10 gram bullet with a horizontal speed of 400m/s hits a block of wood and penetrates 12 cm.
    a. what is the frictional force?
    b.how long does it take the bullet to come to rest

    I have the answers but cannot figure out how to get there. I set my initial velocity to 400 m./s, making my final velocity 0... any help would be great, im going nuts.
     
  2. jcsd
  3. Sep 14, 2006 #2

    arildno

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    Do not ever double post!
    Let the moderators take care of misplaced post.
    I've given you a hint in your first thread.
     
  4. Sep 14, 2006 #3
    okay i used the work energy theorem to find the friction force,and my other thread has disappeared. So what should i use now to find the time it takes to stop, when i tried i got 12 seconds, but that does not seem right whatsoever
     
  5. Sep 14, 2006 #4
    btw the back of the book says the answer should be 600 mu seconds
     
  6. Sep 15, 2006 #5

    arildno

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    Well, assuming the forceyou've found is constant over time, what acceleration does it induce?
     
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