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Force of spring constant

  1. Feb 28, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1.8kg block slides on a rough, horizontal surface. The block hits a spring with a speed of 2.0m/s and compresses it a distance of 0.11m before coming to rest. The coefficent of friction between the block and the surface is 0.560. What is the force constant of the spring?

    2. Relevant equations

    3. The attempt at a solution
    I used Ek=1/2mv^2 to find Ek and I got 3.6J. I can use Ff=uFn to find force friction, but I don't know what to do? help.
  2. jcsd
  3. Feb 28, 2008 #2
    Since you know the mass of the object you would also know the Force of Gravity. Since force of gravity = Normal Force whenever its perfectly horizontal, then you could use that number you got times mew to get your frictional force
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