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प्रश्न
Which of the following example represent periodic motion?
A swimmer completing one (return) trip from one bank of a river to the other and back.
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उत्तर
The swimmer’s motion is not periodic. The motion of the swimmer between the banks of a river is back and forth. However, it does not have a definite period. This is because the time taken by the swimmer during his back and forth journey may not be the same.
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