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Homework Help: Ballistic pendulum

  1. Nov 14, 2005 #1
    a 4.00g bullet moving at 380m/s embeds itself in a wood block of mass 2996g suspended as a ballistic pendulum find: (a)the initial velocity of the block after the impact, and (b) how high the block rises.

    I did it this way can someone tell me if i did it right
    (a)m(1)v(1i) + m(2)v(2i) = (m(1) +m(2))v(f)
    m(1)v(1i)/(m(1)+m(2))=v(f)
    (4.00*380)/(4.00+2996)=.5067m/s

    (b) U+K=U(2) +K(2)
    1/2 mv^2 = mgh
    v^2/2g=h
    .507^2/(2*9.80)=.0131m

    Any Help would be appreciated
     
  2. jcsd
  3. Nov 14, 2005 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Your method is correct. Your numbers look ok too.

    AM
     
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