1. The problem statement, all variables and given/known data Hi all I am having trouble working part b of a question that I am currently doing. I have attached the question below in a pdf file. I am really not sure where to start, I have looked in several book and can only think of relating to the light clock thought experiment. But the problem is I cant see where the $$(ct)^2$$ comes from. 2. Relevant equations $$t'=ϒ(t-(ux/c^2))$$ $$x'=ϒ(x-ut)$$ 3. The attempt at a solution I did attempt to set $$t'=0$$ but this got me no where.