Physics Unit6: Work and Energy (id: 90b0ce469)

本题目来源于试卷: Physics Unit6: Work and Energy，类别为 通用国际物理

[单选题]
You lift a 10-N physics book up in the air a dwftx9xn+ -mr2la p+3fu;9dp9fuh6r fistance m9, wnxwz4p-x2az zbx z7v,l)of 1.0 m, at a constant velocity of 0.50 m/s. Whv x,b9wzzp 4z -n)w2x7mz ,laxat is the work done by the weight of the book?

A. +10 J
B. -10 J
C. +5.0 J
D. -5.0 J


参考答案:  B


本题详细解析: 暂无

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