Conservation of Energy with Spring and Incline (Diagram Included)

[Wara]

Elastic Potential Energy with Spring and Incline (Diagram Included)

Homework Statement

Homework Equations

E_T = 1/2(m)(V²) + mgh + 1/2k*x²

The Attempt at a Solution

E_T1 - W_f = E_T2
1/2k*x² - W_f = mgh + 1/2mV²

where, W_f = [(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.

 

[Wara]

does anyone know why I'm getting that negative error? Is my formula correct?