How to Determine θ for a Sliding Block Sticking to a Pivoting Rod?

[Roddie031]

Homework Statement

In the figure below, a small 60 g block slides down a frictionless surface through height h = 20 cm and then sticks to a uniform rod of mass 105 g and length 40 cm. The rod pivots about point O through angle θ before momentarily stopping. Find θ.
(Picture attached)

Homework Equations

Li=Lf, L=I[omega]

The Attempt at a Solution

I used conservation of energy to find [omega] as the block hits the rod, but I'm not sure if that's right or where to go from there

 

[Roddie031]

I finally solved it! Thanks anyway!