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Hi, here are image of situation. We have observer in point A. He have clock and know distance L between points B and C. He is observing rocket travel from point B to point C at speed near light speed. Can he calculate the speed of rocket using v = L / Time_{A}?

In rocket at point B here are passenger with clock. He knows distance L between points B and C. After arrival in point C he calculates time it took to travel from point B to point C for him. Can he calculate the speed of rocket using v = L / Time_{B}?

From relativity we know that time in rocket will be slower nor for point A. And if rocket speed are 100 km/h?

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# B Calculate the speed of a relativistic rocket by observation...

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