JEE Main Physics question
A stone of mass 1 kg tied to a light inextensible string of length m is whirling in a circular path of radius in a vertical plane. If the ratio of the maximum tension to the minimum tension in the string is 4, what is the speed of the stone at the highest point of the circle? (Take )
Answer: (B)
Solution
Let be the speed at the top. By energy conservation, at the bottom. , , and .
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