Physics Unit4: Force Dynamics & Newton's Laws (id: 0ef962215)

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 packing crate slides down an inclined rampd-fqd s0)y ,py x63s(qidmmq q u0,c 9aat constant velocity. Thus we can dedu0qi a3c( q s,xdm9qm6uce that

A. a frictional force is acting on it.
B. a net downward force is acting on it.
C. it may be accelerating.
D. it is not acted on by appreciable gravitational force.


参考答案:  A


本题详细解析: 暂无

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