Question

A train is traveling along a straight, horizontal track at a constant speed of 20 mph (i.e.,a non-relativistic speed). An observer on the train places paint cans at the front and back of one of the cars. She then detonates the cans. Due to a malfunction, the can at the front explodes 0.1 seconds before the can at the back.

The distance between the paint marks on the train is

A. greater than the length of the train car
B. less than the length of the train car
C. equal to the length of the train car

The distance between the paint marks on the track is

A. greater than the length of the train car
B. equal to the length of the train car
C. less than the length of the train car

Answer 1

1 C

2 less, maybe you run over the mark from the first one on the track just as the rear can explodes, and the two marks on the track are together :)