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When the Hobo says "one second of proper time has passed, because the clocks hanging on the walls of the boxcar say so", then that is sothe truth, in all frames. The, because the clocks on the boxcar walls have proceeded one second in all frames, I mean the second hands of the clocks have moved 1/60th of a full circle, in all frames.

Let's say the Hobo fires the laser from the rear towards the front, because I just prefer that direction. And letslet's say the speed of the boxcar is 0.99 c relative to the track.

When the Hobo says "the laser pulse has now at this moment reached the front", then those people that have the opinion that the front wall is moving rapidly away from the point from where the laser pulse was fired, those people disagree with the Hobo's statement, because those people have the opinion that the front wall is moving at speed 99% of c, and the laser pulse is moving at speed 100% of c to the same direction as the wall, which means that the pulse is approaching the wall at closing speed 1% of c, so it takes quite a long time for the pulse to reach the front wall.

When the Hobo says "one second of proper time has passed, because the clocks hanging on the walls of the boxcar say so", then that is so, in all frames. The clocks on the boxcar walls have proceeded one second in all frames, I mean the second hands of the clocks have moved 1/60th of a full circle, in all frames.

Let's say the Hobo fires the laser from the rear towards the front, because I just prefer that direction. And lets say the speed of the boxcar is 0.99 c relative to the track.

When the Hobo says "the laser pulse has now at this moment reached the front", then those people that have the opinion that the front wall is moving rapidly away from the point from where the laser pulse was fired, those people disagree with the Hobo's statement, because those people have the opinion that the front wall is moving at speed 99% of c, and the laser pulse is moving at speed 100% of c to the same direction as the wall, which means that the pulse is approaching the wall at closing speed 1% of c, so it takes quite a long time for the pulse to reach the front wall.

When the Hobo says "one second of proper time has passed, because the clocks hanging on the walls of the boxcar say so", then that is the truth, in all frames, because the clocks on the boxcar walls have proceeded one second in all frames, I mean the second hands of the clocks have moved 1/60th of a full circle, in all frames.

Let's say the Hobo fires the laser from the rear towards the front, because I just prefer that direction. And let's say the speed of the boxcar is 0.99 c relative to the track.

When the Hobo says "the laser pulse has now at this moment reached the front", then those people that have the opinion that the front wall is moving rapidly away from the point from where the laser pulse was fired, those people disagree with the Hobo's statement, because those people have the opinion that the front wall is moving at speed 99% of c, and the laser pulse is moving at speed 100% of c to the same direction as the wall, which means that the pulse is approaching the wall at closing speed 1% of c, so it takes quite a long time for the pulse to reach the front wall.

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source | link

When the Hobo says "one second of proper time has passed, because the clocks hanging on the walls of the boxcar say so", then that is so, in all frames. The clocks on the boxcar walls have proceeded one second in all frames, I mean the second hands of the clocks have moved 1/60th of a full circle, in all frames.

Let's say the Hobo fires the laser from the rear towards the front, because I just prefer that direction. And lets say the speed of the boxcar is 0.99 c relative to the track.

When the Hobo says "the laser pulse has now at this moment reached the front", then those people that have the opinion that the front wall is moving rapidly away from the point from where the laser pulse was fired, those people disagree with the Hobo's statement, because those people have the opinion that the front wall is moving at speed 99% of c, and the laser pulse is moving at speed 100% of c to the same direction as the wall, which means that the pulse is approaching the wall at closing speed 1% of c, so it takes quite a long time for the pulse to reach the front wall.