(1) υ^2 = 2as1,(80%υ)^2 = 2as2
得乙在接力区需奔出的距离 s2 = 0.64s1 = 16m
(2) s2 = (0 + 80%υ)t/2,得 υt = 40m
起跑时,乙与甲之间的距离应为 υt – s2 = 24m