Bullet Strikes A Block Of Wood

  • Thread starter brick06
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  • #1
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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.
 

Answers and Replies

  • #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.
 
  • #3
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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
 
  • #4
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btw the back of the book says the answer should be 600 mu seconds
 
  • #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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