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A child swinging on a swing in sitting position, stands up, then the time period of the swing will
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decrease
decrease
$\mathrm{T}=2 \pi \sqrt{\mathrm{l}_{\mathrm{eff}} / 8} ;
\mathrm{l}_{\mathrm{eff}}$ decreases when the child stands up.
\mathrm{l}_{\mathrm{eff}}$ decreases when the child stands up.
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