JEE Mains 03-Sep-2020 Shift 1 Solved Paper

A block of mass m=1 kg slides with velocity v=6 m∕s on a frictionless horizontal surfaceand collides with a uniform vertical rod andsticks to it as shown. The rod is pivoted about O and swings as a result of the collision making angle θ before momentarily coming to rest. If the rod has mass M=2 kg, and length l=1 m, the value of theta is approximately :(Take g=10m∕s2)