A billiard ball moving at 5.40 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.48 m/s at an angle of 34.0° with respect to the original line of motion. Assuming an elastic collision (and ignoring friction and rotational motion), find the struck ball's velocity after the collision.
Conservation of momentum, conservation of KE
The Attempt at a Solution
Using conservation of momentum I got the final velocity of the second ball to be approximately 4.709
This is due in about 10 minutes, which is probably not possible for me to do, so at this point I give up on trying to figure it out on my own and need a bit of help understand these concepts as a whole for future homework/exams.