Was the collision inelastic or elastic? ?

45. A billiard ball moving at 5.00 m/s strikes a stationary ball of the same m. After the collision, the first ball moves at 4.33 m/s at an angle of 30� with respect to the original line of motion. (a) Find the velocity (magnitude and direction) of the second ball after collision. (b) Was the collision inelastic or elastic?