[单选题]
A spaceship takes a nons1f1*ngo y wrv)uh iaiwdl/.y2k.o2 l.z+ ogz/top journey to a planet and returns in 10 hours accqq. k/oya2)* e1ctthzk q4c(cording to a clock on the spaceship. If the speed of the spaceship is 0.80c, how much time has elapsed on the Earth?2. aq4(chz kk t1y)ccqt/o*eq
A. $3.2 \; h$
B. $7.0 \; h$
C. $15 \; h$
D. $17 \; h$
Post time 2024-1-14 16:03:04