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Introductory Physics Homework Help
Special Relativity: Relative velocity
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[QUOTE="rude man, post: 4778926, member: 350494"] Your equation is right but you need to redefine the various velocities. You are trying to measure u, the velocity of an object moving with velocity u' as measured in the primed frame, as seen from the unprimed frame. u is velocity of B as seen by A, v is the velocity between the primed and unprimed frames. Your equation reflects this but your definitions of u and u' contradict it. The unprimed (observer) frame is in the A spaceship and the primed frame is on Earth. Then u' is the velocity of B spaceship wrt Earth and v is the relative velocity between the two frames. So u, u' and v are all negative. So for example if A approaches Earth from the left and B from the right, v is negative, u' is negative and so u is negative also. [/QUOTE]
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Introductory Physics Homework Help
Special Relativity: Relative velocity
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