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Newton's Cradle Problem

  1. Jan 17, 2010 #1
    1. The problem statement, all variables and given/known data
    In David and Mervin's Newton's Cradle the 100 g ball was lifted a height of 3.0 cm. With what speed would it collide with the other balls at the bottom of its motion?


    2. Relevant equations
    Eg=mgh
    Ek=1/2mv^2
    100g=0.1 kg
    3.0cm=0.03m


    3. The attempt at a solution[/b]
    Eg=mgh
    Eg=(0.1kg)(9.8m/s^2)(0.03m)
    Eg=0.0294J
    Ek=1/2mv^2
    0.0294J=1/2(0.1kg)(v)^2

    Am i on the right track? I think i am doing something wrong
     
  2. jcsd
  3. Jan 17, 2010 #2

    diazona

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    Homework Helper

    What do you think you're doing wrong? Or why do you think something is wrong?
     
  4. Jan 18, 2010 #3
    ok so what if i use the conservation of energy equation
    Et=Ek=Eg

    would the final equation be
    mgh = 1/2mv2^2
     
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