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1. The problem statement, all variables and given/known data

in a spring pendulum system the spring is initially in equilibrium at upright position with theta = 0 and elongation (mg)/k, (k is spring constant). total length of spring in equilibrium condition is a with respect to which we define additional deviations in terms of a variable r. write dwn the lagrangian for this system

2. Relevant equations

L = kinetic energy - potential energy

kinetic energy = 0.5 mv^2

potential = mgh

3. The attempt at a solution

i know that the l = kinetic energy - the potential energy...but not exactly sure how to form my equations..please help...

i think potential energy would be 0.5(k*x^2) ?

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# Homework Help: Lagrangeian problem

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