Two trains A and B start at the same time with the same speed and in the same direction. Which of these statements is correct about the state of motion of trains?

Train A is at rest with respect to a person sitting in train B.

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Train B is in motion with respect to a person walking inside train A.

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Train A is at rest with respect to a person standing on the platform.

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Train B is in motion with respect to a person sitting in train A.

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Solution

The correct option is B Train B is in motion with respect to a person walking inside train A.
The state of motion of an object depends on the viewer’s frame of reference.
Since train A and B start at the same time with the same speed and in the same direction, train A is at rest for a person sitting inside train B and vice versa.
For a person standing on the platform, both the trains would appear to be in motion.

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