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**1. Homework Statement**

**2. Homework Equations**

K[tex]_{1}[/tex]+U[tex]_{1}[/tex] +W[tex]_{nc}[/tex] =K[tex]_{2}[/tex] + U [tex]_{2}[/tex] (The subscript coding is not working right, but they ARE suppose to be subscripts and nothing is squared)

Work on the spring = .5kx[tex]_{2}[/tex] - .2kx[tex]_{2}[/tex] (final minus initial)

**3. The Attempt at a Solution**

I didnt use the 1st equation because this problem doesn't involve any up and down movements (y direction / same potential all over).

So I tried the 2nd but because to net work is 0 both x (distance) become 0 also and I can't have any way of solving for k. They don't tell us how much it compressed so I can't make a new final / initial point.

What am I missing?