1. The problem statement, all variables and given/known data A 5.00 X 10^-3 kg steel ball moving 1.20m/s collides elastically (no loss of kinetic energy) with an identical, stationary steel ball. The incident ball is deflected 30 degrees from its original path. (a) Draw a vector diagram showing the paths of both balls after the perfectly elastic collision. (b) What is the velocity of the incident ball after the collision? 2. Relevant equations All I used is the initial momentum = final momentum theorem and p=mv. 3. The attempt at a solution a I drew the vector diagram: -----> \30d | \ | p=mv \ | =.006kgm/s \ | \ | \ | a=.005196kgm/s p=mv v= 1.04m/s Is this the correct way to do it? I think i mixed some things up as the velocity I found was for the horizonal vector, which should be the struck ball.. It feels like I made a real obvious mistake.. but its just out of reach..