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Inelsatic Collisions

  1. Oct 17, 2009 #1
    1. The problem statement, all variables and given/known data

    A bullet of mass 6 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 14 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

    2. Relevant equations

    KE=1/2(mv^2)

    3. The attempt at a solution[/b
    The entire mass of pendulum & bullet rises 0.14 m,
    this is a P.E. change of mgh (where m = 2.006 kg, h = 0.14 m)
    P.E.(increase) = 2.006(9.81)(0.14) = 2.755 J
    The initial K.E. of the bullet must equal this increase
    1/2 mv² = 2.755
    mv² = 5.510
    v² = 5.510/0.006)
    v² = 918.3
    v = 30.3 m/s ANS
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 17, 2009 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    Conservation of energy is not valid for inelastic collision.

    ehild
     
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