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 rest)q-hz t8pnamrk;t8c*p0kl w+cg ,j-vs on a level frictionless surfdb m7wcac2* .t69c nab2 oyo8oace. A force F acts on the stadacy7bbao9tn* 62 om2 .ccow8ck, and it accelerates 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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