Respuesta :
The equation that she should use is k = 2P/x²
Given the expression that represents the potential energy P, in the spring as;
- [tex]P = \frac{1}{2} kx^2[/tex]
we are to make the variable "k" the subject of the formula;
Given
- [tex]P = \frac{1}{2} kx^2[/tex]
Cross multiply
- 2P = kx²
Divide both sides by x²
2P/x² = kx²/x²
2P/x² = k
k = 2P/x²
Hence the equation that she should use is k = 2P/x²
Learn more on subject of formula here: https://brainly.com/question/657646