Overweight and underweight (id: 87518bd9f)

本题目来源于试卷: Overweight and underweight，类别为 美国物理杯赛(Physics Bowl)

[单选题]
03.06: A 2 kg mass and a 4 kg mass on a horizontal fnu8leuv8z30*cy l/l5 ons8u griction if0s;dpbk3u.*b1l0m / bwhl( yrlx9aless surface are connected by a massless string A. They are pulled horizontally across the surface by a second string B with a constantdlbl/0lf(xkuw ;. mb h*s3 r 0p1iba9y acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string B on the 2 kg mass?

A. 72N
B. 48N
C. 24N
D. 6N
E. 3N


参考答案:  A


本题详细解析: 暂无

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