Answer :

Given


The length of the rod attaching the block is given as l.


Formula Used


Using the conservation of static and dynamic energy such as potential and kinetic energy, we have the conservation equation as



where


m is the mass of the object, v is the velocity, g is the acceleration due to gravity and h is the height at which the object is kept.


Explanation


Equating the conservation of energy, we get the minimum velocity of the block to complete a vertical circle, the length is double when forming circle




The minimum velocity of the block is


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