If I have a energy of a particle and I need to calculate the expression for force on it how do i do it.(adsbygoogle = window.adsbygoogle || []).push({});

eg: energy of a spring = k*(|x1-x2| - L )^2

where x1 and x2 are particle at end of the springs and K is stiffness. L rest length.

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# Force and energy

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