[单选题]
The length of a spaceship is 10 m when it is at sx8+dzy)*m6hj6 an3 uh4 jks(cd 9tvgrest. If p*(bw 5l0sbdbthe spaceship travels by you with a speed of sl0bp*bd(5 bw 0.70c, what length does it appear to you?
A. $5.5 \; m$
B. $7.1 \; m$
C. $12 \; m$
D. $18 \; m$
Post time 2024-1-14 16:03:04