Motion in A Plane

Question: The maximum velocity at the lowest point, so that the string just slack at the highest point in a vertical circle of radius \[l\]



1) \[\sqrt {gl} \]
2) \[\sqrt {3gl} \]
3) \[\sqrt {5gl} \]
4) \[\sqrt {7gl} \]
Solution: Explanation: Explanation
Non-uniform-circular-motion

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