Question: A moves at speed v, and B is at rest, as shown in Figure. How fast must C travel, so that she sees A and

A moves at speed v, and B is at rest, as shown in Figure. How fast must C travel, so that she sees A and B approaching her at the same rate? In the lab frame (B??s frame), what is the ratio of the distances CB and AC? The answer to this is very nice and clean. Can you think of a simple intuitive explanation for theresult? ! A C B

! A C B

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