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    kinetic energy in Lagrangian

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    I need an explanation of how one gets from the top equation (with v)s given by to the bottom equation where v is given by l*(theta)dot. I do not need an explanation of the double pendulum.

    Derive the kinetic energy equation of the double pendulum in Lagrangian.

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    https://brainmass.com/physics/energy/kinetic-energy-lagrangian-206874

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    It shows the steps of deriving the given kinetic energy equation in Lagrangian for the double pendulum.

    $2.19

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