I'm having some difficulty to understand the work and Energy method (aka Clapeyron theorem), especially with different loads.

Could you please help me to fix this problem, because I found different formula of Work and Energy method:

$$U(F_i)= \frac{1}{2}\sum_{i=1}^n Fi \cdot \Delta_{i=1}$$


$$U(F)= \frac{1}{2}F \cdot \Delta_{}$$

Is this method applicable using different loads or only for one?


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