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Conservation of Energy with Spring and Incline (Diagram Included)

  1. Apr 21, 2012 #1
    Elastic Potential Energy with Spring and Incline (Diagram Included)

    1. The problem statement, all variables and given/known data
    04.21.2012-17.21.10.png


    2. Relevant equations
    ET = 1/2(m)(V2) + mgh + 1/2k*x2


    3. The attempt at a solution
    ET1 - Wf = ET2
    1/2k*x2 - Wf = mgh + 1/2mV2

    where, Wf = [(0.53)(2kg)(9.8m/s2)(cos67)](1.3m+0.4m)

    ^ I used this formula and went through by subbing in all numbers but I get error since you can't square root a negative value. Plus we can assume Height off ground is negligible since it cancels out on both sides of equation.
     
    Last edited: Apr 21, 2012
  2. jcsd
  3. Apr 21, 2012 #2
    does anyone know why I'm getting that negative error? Is my formula correct?
     
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