Space Time & Motion A.3 Work Energy and Power (id: 0358720d4)

本题目来源于试卷: Space Time & Motion A.3 Work Energy and Power，类别为 IB物理学

[单选题]
A small ball of mass $m$ is attached to a string and moves in a vertical circular path of radius $r$.



What is the minimum velocity $v$ at the lowest point of the path for the ball to continue moving in a circular path at top of the circle?

A. $2\,m\,g\,r$
B. $\frac{m\,g\,r}{2}$
C. $\sqrt{2\,g\,r}$
D. $\sqrt{5\,g\,r}$


参考答案:  D


本题详细解析:

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