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]
A 4.00-kg box of fru 9gs+, cwi-8omq*e zcbit ei-5 zrdnx9 )ajsg ;:*d bau,8ch.j avslides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?
A. $157 \; J$
B. $-157 \; J + 78.4 \; J$
C. $78.4 \; J$
D. $-78.4 \; J$
参考答案: A
本题详细解析:
暂无
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