[填空题]
Rocket A passes Earth at a speed i q a47lmvf90+4p rrkeof 0.75c. At tch22 e5 )smzdt8 xkql*he same time, rocket B passes Earth moving 0.95c relative to Earth in thesc q8x5)medt2 l2khz* same direction. How fast is B moving relative to A when it passes A? u' = c
