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What was the speed of the bullet before it hit the block?

  1. Jan 17, 2008 #1
    Physics HELP!!!

    1. The problem statement, all variables and given/known data

    A 2.00-g bullet hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.40-m long string. This causes the block to swing through an arc of 4.50. What was the speed of the bullet before it hit the block?


    2. Relevant equations



    3. The attempt at a solution

    I tried to set the masses equal to each other and then use cos for 4.50 in an attempt to find v not
     
    Last edited: Jan 17, 2008
  2. jcsd
  3. Jan 17, 2008 #2

    berkeman

    User Avatar

    Staff: Mentor

    You need to show some of your work before we can offer tutorial help -- that's in the PF Rules.

    What are two approaches that you could take to this problem? Why is the conservation of total energy approach the easiest?
     
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