本题目来源于试卷: Space Time & Motion A.3 Work Energy and Power，类别为 IB物理学
[单选题]
An object of mass $1.0\,kg$ rests on a rough surface. Another object of mass $2.0\,kg$ is connected to it with a string.
When the objects are released, the masses accelerate at $\frac{g}{2}$. The work done by the tension of the string on the $1.0\,kg$ mass is $40\,J$. Which of the Magnitude of the force of friction and N Distance travelledis following is correct for the $1.0\,kg$ mass during this period?
A. $10\;\;\;\;4.0\,m$
B. $5\;\;\;\;4.0\,m$
C. $10\;\;\;\;2.0\,m$
D. $5\;\;\;\;2.0\,m$
参考答案: B
本题详细解析:
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