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 kg :xjvjb4i w 8llbshjb3):yh+.mass on a horizontal fric c25 w)l6sw532bqjdt,wx x h92 baf e1w3bfih ctionless surface are connected by a massless string A. They are pulled horizontally across the surface by a second stri 2tdwc aq2x 2 wf59,fc31sbhilb w6)e hjxw53b ng 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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