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  4. A stone is tied at one ends of a 5 m long string and whirled in a vertical circle. The minimum speed at the top required to just cross this position is

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Q. A stone is tied at one ends of a $5\, m$ long string and whirled in a vertical circle. The minimum speed at the top required to just cross this position is

System of Particles and Rotational Motion

Solution:

$v =\sqrt{ gr }=\sqrt{9.8 \times 5}=7\, m / s$