1. The problem statement, all variables and given/known data 2 balls, their size is the same but mass is different, they are going towards a collision. I do not know what is the word for it in english but its like this m1= 1,2m2. Speed of the balls are v1=12m/s and v2= 15m/s.Calculate the speed of each ball after absolutely central elastic collision. 2. Relevant equations p=mv p=p, 3. The attempt at a solution I could not even think of a solution since I missed out some classes.