The question is as follows: A 4g particle moving at 30 m/s collides with a 0.99 g particle initially at rest. After the collision the two particles have velocities that are directed 27 degrees on either side of the original line of motion of the 4 g particle. What is the speed of the 0.99 g particle after the collision? Answer in units of m/s. I hate to be a beggar for answers, but I have truly been stumped by this problem. I had relatively little problem with the other collision/momentum problems, but for some reason, I am not sure what angle to take to solve this problem. To begin with, I converted the units into the standard mass units of Kg. I then drew the figure and broke down the motion of the second particle into components - Vfx(cos 27) and Vfy(sin 27). However, from here I do not know what to use. I looked at the momentum conservation theory/equations, but the ones I have require more variables than I know how to solve for. Any help would be appreciated!