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2015-05-02T14:58:26+05:30
the kinetic energy is maximum in the middle of the swing
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2015-05-02T15:28:45+05:30

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   It is a gravity pendulum.  It swings in a simple harmonic motion (SHM) with a time period :

  T = 2π √(L/g)   
         L = length of the thread      and 
         g = acceleration due to Gravity of Earth at that location.

  the angular frequency of the oscillation √(g/L)

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