Hello Professor,
I am currently working on the following question and was wondering if you could offer any help. I'm just not sure how to factor in the 30 degrees. this is of course a completely elastic collision. any help would be great.

Two pool balls are rolling along a pool table. The red pool ball has a velocity of 10 cm/s west and the blue ball a velocity of 10 cm/s north 30 east. What are the velocities of the balls after the collision?