In the old west, a marshal riding on a train traveling 50 m/s seesa duel between two men standing on the Earth 50 m apart parallel tothe train. The marshal's instruments indicate that in hisreference frame the two men fired simultaneously.
(a) Which of of the two men, the first one the train passes (A) orthe second one (B) should be arrested for firing the first shot? That is, in the gunfighter's frame of reference, who firedfirst?
(b) How much earlier did he fire?
(c) Who was struck first?