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 stre7al,)w qb6 ,sebd85bq:h ornong string and whirledp*at8 htp:9m4a be)gm.z- x id in a vertical circle of radius r. At the exact bottom of the path the tension in the string is 3 times the stone's weight. The stone's speed at thi9t pg-dx4* 8e:.athz a m)bmpis 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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