Compute time “dilation” in the train: look at transit time up and down of a light pulse to a mirror, first on the train rails:

• Compute time “dilation” in the train: look at transit time up and down of a light pulse to a mirror, first on the train rails:

• time t’ = 2h/c.

• Now look from the moving train:

• and we calculate the triangle

• (c t/2)2 = h2 + (V t/2)2

• or

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