The time period to complete 1 swing is 3.2 seconds
The calculation can be done as follows;
50 complete swings are completed in 2 minutes 40 seconds
2 minutes 40 seconds to seconds is
= 2mins to seconds is 120 seconds
= 120 seconds + 40 seconds
= 160 seconds
50 complete swings= 160 seconds
1 complete swing= 160/50
1 complete swing= 3.2
Hence the time period for 1 complete swing is 3.2 seconds
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