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 st3ty zp vpuie5,)2m 9dzraight line with consta:gk/hx5z a o2dz3*l9ct 6htbj nt speed. It is far from the gravitatiog*ztzbd2 o39j5c alth/x kh:6nal 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:
暂无
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