[单选题]
A spaceship moves awayx 0br o.74gefz fromkf yx0.v:z6:y1btppk ; rpa4u the Earth 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 the missile measu40fr;t x6z1yu kvpppbyak.::red by observers on the Earth if the missile is fired toward 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