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Grade 9 Test on Mechanics 20241217 (id: abd285e8b)

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admin 发表于 2024-2-6 02:21:25 | 显示全部楼层 |阅读模式
[单选题]
A packing crate slides down an inclined ramp at constant s(c . 3m6oliisy4 pxy1velocity. Thux ;)zvn 1vcafzwa/8p7s we can d;z8vap7)n zx v/w1faceduce 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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