Question

Two firecrackers explode simultaneously 125 m apart along a straight railroad track. A train moves along...

Two firecrackers explode simultaneously 125 m apart along a straight railroad track. A train
moves along the track at 25 m s−1.
(a) How far apart are the explosions as measured by the train driver?
(b) If instead of a simultaneous explosion, the firecracker 125 m farther ahead explodes 3 s
before the other. How far apart would the explosions be to the train driver?
(c) What can you conclude from your calculations in (a) and (b)?

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