1. The problem statement, all variables and given/known data Two firecrackers explode simultaneously 125 m apart along a railroad track, which we can take to define the x axis of an intertial reference frame. A train (the other reference frame) moves at a constant 25 m/s in the +x direction relative to the track frame. a) According to the galilean transformation equations, do the firecrackers explode at the same time? b) How far apart are the explosions as measured by the train frame? c) Assume that instead of the explosions being simultaneous, the firecracker farther ahead in the +x direction explodes 3.0 s before the other. How far apart would the explosions be as measured in the train frame? 2. Relevant equations t'=t x'=x-vt y'=y z'=z 3. The attempt at a solution For part a, the answer would be yes. For part b, I am having trouble using the equation x'=x-vt. I understand that v = 25, but I'm confused as to what t I'm supposed to plug in and what x value.