1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    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?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook