本题目来源于试卷: Physics Unit5: Circular Motion & Gravitation，类别为 通用国际物理
[单选题]
A stone, of mass m, is m4bi.4bo 7 1+zu hxt mi6vdtyy4f u9,wattached to a stroi:.. tg5snvf zng string and whirled in a vertical circle of radius rts.i.n vf5z :g. At the exact bottom of the path the tension in the string is 3 times the stone's weight. The stone's speed at this point is given by
A. $2\sqrt{gr}$
B. $\sqrt{2gr}$
C. $\sqrt{gr}$
D. $2gr$
参考答案: B
本题详细解析:
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