Mark:
What effect does the mass of the ball have on the period of a simple pendulum?
4.​

The period of a pendulum does not depend on the mass of the ball, but only on the length of the string. Two pendula with different masses but the same length will have the same period. Two pendula with different lengths will different periods; the pendulum with the longer string will have the longer period.

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The answer is on suffrage experience.