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A ball of mass of 10 kg is attached to one end of a string. The...

A ball of mass of 10 kg is attached to one end of a string. The other end of the string is attached to the ceiling. The ball swings and undergoes 5 full oscillations in 18.00 seconds.
(a) Calculate the length of the string.
_____ m
(b) If the amplitude of motion of the pendulum is 15, calculate the total energy of the oscillator.
_____ J

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