Physics · Special Relativity
Two trains, each having proper length L0, are moving towards each other with the same speed v but in opposite directions as measured by an observer in an inertial frame. What is the length of one of the trains as measured by an observer in the other train?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1L0√1 - v2c2
- 2L0√1 - v24c2
- 3L0√c2 - v2c2 + v2
- 4L0c2 - v2c2 + v2✓
Correct answer
L0c2 - v2c2 + v2
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