1. The problem statement, all variables and given/known data a ball of mass 2kg is traveling North with a Velocity 6m/s when it collides with an identical, stationary ball. after the collision, one of the ball moves with a velocity of 2m/s at an angle of 30deg east of north. find Velocity of the other ball. m1=2kg m2=m1 v1=6m/s v1'=2m/s alpha=30deg v2'=? theta=? 2. Relevant equations P(initial)=P(final) <--conservation of momentum P=mv 3. The attempt at a solution split the (conserved) momentum into x and y components. Px: 0+0=m1v1'sin(alpha)-m1v2'sin(theta) Py: m1v1=m1v1'cos(alpha)+m1v2'cos(theta) after that, I'm lost. I honestly have no idea where to go from there. I think maybe you're supposed to solve for... theta? and then plug that in. but again, I don't know how to do so. we just barely[and when I mean barely, I mean for about 1 minute at the end of class] covered this today, and our book details only inelastic collisions in two dimensions, which is of little help here, as it is not stated to be elastic or inelastic. help would be very, VERY much appreciated.