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]
An 800-N box is pushe b) /he 1aeic-7rqqyi5a, n:u.:7dkyg 0szrz zo9f8clq6tf i 5d up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average frictionl9865cf itofq force on the box?
A. $0 \; N$
B. non-zero, but less than 400 N
C. $400 \; N$
D. greater than 400 N
参考答案: C
本题详细解析:
暂无
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