Answer:
The girl and the swing together constitute a pendulum of time period, \[T=2\pi \sqrt{\frac{l}{g}}\] As the girl stands up, her \[\text{C}.\text{G}.\]is raised. The distance between the point of suspension and the \[\text{C}.\text{G}.\]decreases i.e., length \[l\] decreases. Hence the time period T decreases.
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