[填空题]
In a nuclear reaction two identical par( u*vmy)2vkh jg rb/a,ticles bbz y2goiw :99x;8 sveare created, traveling in opposite directions. I9w2ioxz8 ;9g ysb:ebvf the speed of each particle is 0.75c, relative to the laboratory frame of reference, what is one particle's speed relative to the other particle? u = c
