4. A red light flashes at position xR = 3.00 m and time tR = 1.00 ns, and a blue light flashes at xB = 5.00 m and tB = 9.00 ns, all measured in the S reference frame. Reference frame S’ moves uniformly to the right and has its origin at the same point as S at t = t’ = 0. Both flashes are observed to occur at the same place in S’. (a) Find the relative speed between S and S’. (b) Find the location of the two flashes in frame S’. (c) At what time does the red flash occur in the S’ frame?


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