JEE Main 12 Jan 2019 Shift 2 Solved Paper

A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from the point A,as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. When the particle reaches point B, its angular momentum about O will be :
(Take g= 10 m/s2)