[填空题]
Two spaceships leave xrw2nz,17 nm lEarth in opposite teu03 )x h:lkydirections, each with a speed of 0.50c with respect to Earth. 0kyxe u)l 3:ht (a) What is the velocity of spaceship 1 relative to spaceship 2? u = c
(b) What is the velocity of spaceship 2 relative to spaceship 1?u = c
