Answer
The capacitor should be connected in parallel as parallel connection gives the arithmetic sum of capacitance which will give a corresponding sum of energy while capacitors in series gives the sum of the reciprocal if the individual capacitance
 
        
             
        
        
        
Using the equation for period length for a pendulum, you get 32.829 meters.
        
             
        
        
        
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     Time = (displacement) / (magnitude of average velocity) .