[单选题]
A spaceship moves away from thez2k-n+n + us(5rj nrva Ear qjd4:s21hx0 jf0n uqoth with a speed of 0.80c. The spaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the velocity of thhos0jd14: ufq qj20nxe missile measured by observers on the Earth if the missile is fired away from the Earth?
A. $0.30 \; c$
B. $0.50 \; c$
C. $0.93 \; c$
D. $1.3 \; c$
Post time 2024-1-14 16:03:04