1. The problem statement, all variables and given/known data I have been working some questions on decay but when i considered these 2 examples, there seems to be a problem 2. Relevant equations 3. The attempt at a solution Answer to first one is B while that of the second one is C. When I considered them separately, the answers seem ok, but looking at both, it seems contradicting. For the one first, since the nucleus have greater mass, i assume that they have most kinetic energy since this depends on mass. but for the second one, since TH is heavier, it moves slowly, so most of the kinetic energy goes to the aplha. Hence, answer C. But this IS contracdicting right? IS there something wrong here?