本题目来源于试卷: Physics Unit4: Force Dynamics & Newton's Laws，类别为 国际高中通用物理
[单选题]
A stack of books rests le93ac :r2qey on a lez-+v cu /ffj4scrd19z vel frictionless surface. A force F acts on the stack, and it accelera4usccr 9 j/v-z1df+fztes 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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