本题目来源于试卷: Physics Unit4: Force Dynamics & Newton's Laws，类别为 通用国际物理
[单选题]
A rocket moves through empty space in a straight lihn3d8m v3ja. d vypuwd/ ;bh56ne with constant speed. I d (v4c7pi c+:zkorfr8p-a,y kt is far from the gradyc c (84a7:v-pozkr p,kr+ ifvitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is
A. equal to its weight.
B. equal to its mass.
C. dependent on how fast it is moving.
D. zero.
参考答案: D
本题详细解析:
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