1. The problem statement, all variables and given/known data A ball of mass m = 1.9 kg moving with a speed of v0 = 20.1 m/s strikes an identical ball which was initially at rest. After the collision, the incoming ball (ball 1) goes off at q1 = 26° relative to its original direction and the struck ball (ball 2) moves off at q2 = 36° as shown in the diagram. What magnitude of kinetic energy was lost (to sound, heat, etc.) in the collision? 2. Relevant equations ΔKf-ΔKi 3. The attempt at a solution The final velocity of the billiard balls came up to be ball 1= 13.29 m/s and ball 2= 9.92 m/s so...ΔK= 1/2 m(13.292+9.922)-1/2m(20.12) m=1.9 am i doing this right?