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If the bar is 0.66 m long and the clay is moving at 5.7 m/s before striking the bar, what is the final speed of the center of mass?

I found this part to be 1.012 m/s, which is correct, simply using conservation of linear momentum.

I can't figure out the next part:

At what angular speed does the bar/clay system rotate about its center of mass after the impact?

I tried using conservation of angular momentum, which seems to me like it should work, but the computer says it's wrong. I tried it assuming the center of mass doesn't change when the clay hits it, and then did it again figuring in the change in center of mass.