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A child swinging on a swing in sitting p...

A child swinging on a swing in sitting position, stands up, then the time period of the swing will.

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The periodic ti, T will decrease because in the standing position, the location of centre of mass of the girl shifts upwards. Due to it, the effective length of the pendulum, 'l' (i.e., of swing) becomes less. As `Tprop sqrt(l), therefore, T decreases.
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