本题目来源于试卷: Physics Unit5: Circular Motion & Gravitation，类别为 国际高中通用物理
[单选题]
A stone, of mass m, i*yrvji v8(p tln: u6bih9r+)2dj 0xdbs at25vd)4 cvv xc5ogh2vp tached to a strong string and whirled in a vertical circle of radius r. At the exact bottom of the path the tension in the string is 3 times the shv2vc24pcv5 5v) x ogdtone'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:
暂无
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