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The girl sitting on a swing stands up. What will be the effect on periodic time of swing?

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The girl sitting on a swing stands up. What will be the effect on periodic time of swing?

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The periodic time T is directly proportional to the square root of effective length of pendulum (l). When the girl starts up, the effective length of pendulum (i.e. Swing) decreases, so the Time period (T) also decreases. 

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