本题目来源于试卷: Physics Unit4: Force Dynamics & Newton's Laws，类别为 通用国际物理
[单选题]
A stack of books rests on a level frictionless surface. A force F utkej744(sbz/ zss,e mwe*w . fant4b4av 7)yacts on the stack, and it acceleratesfy7)4b 4aatvn at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?
A. $1.0 \; kg$
B. $2.0 \; kg$
C. $3.0 \; kg$
D. none of the above
参考答案: B
本题详细解析:
暂无
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