[单选题]
A rocket moves through outer spacey56 hs n n:+9qehutf)w with a constant velocity of 9xn:dwt3ikl ; ,.8 m/s. What net l,dx3iw: ktn; force acts on it?
A. a force equal to its weight on Earth, mg
B. a force equal to the gravity acting on it
C. The net force is zero.
D. cannot be determined without more information
