Question: please help me A pendulum is timed as it swings back and forth. A stop watch is started when the bob is at the left

please help me

A pendulum is timed as it swings back and forth. A stop watch is started when the bob is at the left end of its swing. When the bob returns to the left end for the 60th return, the clock reads 80 s. What is the period of vibration? (1)

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