Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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A Stone is Fastened to One End of a String and is Whirled in a Vertical Circle of Radius R. Find the Minimum Speed the Stone Can Have at the Highest Point of the Circle. - Physics


A stone is fastened to one end of a string and is whirled in a vertical circle of radius R. Find the minimum speed the stone can have at the highest point of the circle.

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Let m be the mass of the stone.
Let v be the velocity of the stone at the highest point. 
R is the radius of the circle.
Thus, in a vertical circle and at the highest point,

we have :

\[\frac{\text{mv}^2}{\text{R}} = \text{mg}\]

\[ \Rightarrow \text{v}^2 = \text{Rg}\]

\[ \Rightarrow \text{v} = \sqrt{\text{Rg}}\]

  Is there an error in this question or solution?
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HC Verma Class 11, 12 Concepts of Physics 1
Chapter 7 Circular Motion
Q 10 | Page 114
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