Welche Antwort ist richtig?
Aufgabe:
A train is 200 feet long in its own frame, and a railroad platform is 160 feet long in its own frame. The train rushes past the platform so fast that, in the platforms´s frame, the train and platform are the same length. How fast was the train moving?
- 4/5 c
- 5/4 c
- 3/5 c
-5/3 c
Aloha :)$$\sqrt{1-\frac{v^2}{c^2}}\stackrel{!}{=}\frac{160}{200}=\frac{4}{5}$$$$1-\frac{v^2}{c^2}=\frac{16}{25}$$$$\frac{v^2}{c^2}=\frac{9}{25}$$$$v=\frac{3}{5}c$$
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