A particle of mass \( 20 \mathrm{~g} \) is released with an initial velocity \( 5 \mathrm{~m} / ...

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A particle of mass \( 20 \mathrm{~g} \) is released with an initial velocity \( 5 \mathrm{~m} / \mathrm{s} \) along the curve from the point \( A \), as
\( P \) shown in the figure. The point \( A \) is at height \( h \) from point \( B \). The particle slides along the frictionless
W surface. When the particle reaches point \( B \), its angular momentum (in \( \mathrm{kg} \mathrm{m}^{2} / \mathrm{s} \) ) about \( \mathrm{O} \) will be (Take \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) )
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