Overweight and underweight (id: 4d151274f)

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]
03.07: A 2 kg mass and a 4 kgd: 8/fd /*6)hyls xo8gwilz yz mass on a horizontal frictionless cz;g6oj,djs5s k.8 zksurface are connected by a massless string A. They are pulled horizontally across the surface by a second sz .od65c; ,sz kjsk8gjtring B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string A on the 4 kg mass?

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


参考答案:  B


本题详细解析: 暂无

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