1. The problem statement, all variables and given/known data For the nuclear reaction, 1 neutron (1/0n) + 10/5B → 7/3L + 4/2He (alpha particle) assume that the initial kinetic energy and momentum of the reacting particles are negligible. Calculate the speed of the alpha particle immediately after it leaves the reaction. 2. Relevant equations E = mrestc^2 Ek = (mtotal (before) - mtotal (after))c^2 3. The attempt at a solution I really have no idea because there is no change in mass that I can see, and that is all I had to look for with questions similar to these in this chapter.