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Homework Help: Kinematics and springs

  1. Dec 9, 2009 #1
    1. The problem statement, all variables and given/known data

    A 4.0 kg block slides along a frictionless horizontal surface at 5.0 m/s. It runs into and compresses a spring with a spring constant of 200 N/m. How far does it compress the spring before it stops and changes direction?

    2. Relevant equations

    P.E. = 0.5 kx^2
    K.E. = 0.5 mv^2

    3. The attempt at a solution

    x = sqrt (mv^2/k) = 0.707 m?
  2. jcsd
  3. Dec 9, 2009 #2
    that's right.
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