
You don't really need to draw a graph to figure that out. We can't draw them for you here, anyway. You will have to convert the 3.6 cm to 0.036 m and the 5.6 cm to 0.056 m.
The answer is k[(.056)^2  (.036)^2]
If you used a graph to do it, you should plot the force kx vs x and measure tha area under the curve from x = 0.036 to x = 0.056. You should get the same answer, since the area is a trapezoid with width 0.020 and average height 0.046.

but when you did this.... k[(.056)^2  (.036)^2]
k = 88 right?
88(.056^2  .036^2)
then the answer would be .16192? it said that its incorrect. im alittle confused?

It's because, you the equation is
1/2(K)(x^2)
So you change the cm to meters, and then you subtract, getting (.02) then you get (.02)^2, cuz u have to square it,
Then you * by K which is 88, and then divide by 2. That gives you the SPE, (spring potential energy)
