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 attached to a strong strinl bawazd8 . 8m+itf*-jg xq *c2pk,we2 oefld:/and whirled in a vertical circle of radius r. At the exact top of the path twpo f: dc2 k,x/ele*q2he 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: A
本题详细解析:
暂无
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