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Inelastic Collisions

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data

    In the figure below, block 2 (mass 1.4 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 170 N/m. The other end of the spring is fixed to a wall. Block 1 (mass 2.0 kg), traveling at speed v1 = 4.0 m/s, collides with block 2, and the two blocks stick together. When the blocks momentarily stop, by what distance is the spring

    2. Relevant equations

    m1v1=m2v2

    3. The attempt at a solution
    I attempted the solution but I am confused about the 170N/m
    How would I use that information and relate it to the equations of inelastic collision?
     
  2. jcsd
  3. Oct 18, 2009 #2

    rl.bhat

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    Homework Helper

    Find the velocity of the combined blocks after collision. Then find the KE of the the combined blocks.
    What is the expression for the energy stored in a compressed spring?
     
  4. Oct 18, 2009 #3
    ohhh okk i got it
    I had to use W=1/2kx^2
    they gave k and i figured out W through the KE equation.
    it was 0.33 m if you were curious.
     
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