The minimum velocity at the lowest point, so that the string just slack at the highest point in ...

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The minimum velocity at the lowest point, so that the string just slack at the highest point in a vertical circle of radius \( l \)
[CPMT 1999; MH CET 2004]
(a) \( \sqrt{g l} \)
(b) \( \sqrt{3 g l} \)
(c) \( \sqrt{5 \mathrm{gl}} \)
(d) \( \sqrt{7 g l} \)
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