A red pool-table ball moving at 2.5 m/s strikes a blue, stationary pool-table ball of the same mass.
After the collision, the red ball moves at 2.17 m/s, at an angle of 30.0° above the original line of motion.
Assuming an elastic collision (and ignoring friction and rotational motion), find the blue ball's velocity after the collision.

speed: ____ m/s

direction: ____ degrees above/below horizontal