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 an1q9on;g 7jsgnq+rf+k09nc aw dg5q/ bd a 4 kg mass on a horizontal frictionless surface are conmw(m .ee c:dm(y*i -vi9fr. avv 9jwghci-s;+nected by a massless string A. They are pulled horizontally across the surface bs(veciwvea-( w+ d:mvy -j9.9mfh; rm .*ciig y a second string B with a constant 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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