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Spring Energy (Finding Velocity)

  1. Jun 1, 2013 #1
    1. The problem statement, all variables and given/known data
    A spring AB or constant k = 2N/m is attached to a support A and to a collar of mass
    m=1kg. The unstretched length of the spring is 1m, Knowing that the collar is released
    from rest at x = x0 = 0.9 m and neglecting friction between the collar and the horizontal
    rod, determine the magnitude of the velocity of the collar as it passes through point C.
    here l = 1.2m,

    2. Relevant equations
    T1 + U1-2 = T2
    T Kinetic Energy
    U Potential Energy

    3. The attempt at a solution
    I just wanted to see if the answer is right ??
    IMG_0872.jpg
     
  2. jcsd
  3. Jun 2, 2013 #2

    lewando

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    Looks okay.
     
  4. Jun 2, 2013 #3

    TSny

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    I don't think you handled the work done by the spring correctly. It is not k(.3)2/2.
     
  5. Jun 2, 2013 #4

    lewando

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    I don't see it... I thought he was correct noting the length of the spring changes from 1.5m to 1.2m.
     
  6. Jun 2, 2013 #5

    TSny

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    x22-x12 ≠ (x2-x1)2
     
  7. Jun 2, 2013 #6

    lewando

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    Now I see it...thanks.
     
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