本题目来源于试卷: Newton’s law of motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
07.18: In which one of the following situs.2tyv t+il+j eeu*l,8ri,pzations is the neta;,xz e2*wy 7 kdkjm.s force constantly zero on the objecta*;jz,ws kyd2em x.k7?
A. A mass attached to a string and swinging like a pendulum.
B. A stone falling freely in a gravitational field.
C. An astronaut floating in the International Space Station.
D. A snowboarder riding down a steep hill.
E. A skydiver who has reached terminal velocity.
参考答案: E
本题详细解析:
暂无
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