A pendulum makes 50 complete swings in 2 min 40 second . what is time period for 1 complete swing?

3.2 seconds

Explanation:

50 swings = 2 mins 40 secs

= 50 swings = 2 x 60 + 40 secs

= 50 swings = 160 secs

= 1 swing = 160 / 50 secs

= 1 swing -= 3.2 secs

like poles repel so keep pushing north to north and repels funny to see this

close lines strong magnet less close weaker