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 pushed up ankad/ad /+rsq8el0 b8s inclined plane. The plane is 4.0 e vg.p /i(kvka7.it(bj (2yxam 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 friction force on the box?2a.g( ve i7kp./((jtb xivya k
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:
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