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  4. A particle of mass m is fixed to one end of a light rigid rod of length l and rotated in a vertical circular path about its other end. The minimum speed of the particle at its highest point must be :

Q. A particle of mass $m$ is fixed to one end of a light rigid rod of length $l$ and rotated in a vertical circular path about its other end. The minimum speed of the particle at its highest point must be :

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Solution:

The light rod cannot slack during revolution and particle is able to move to topmost point of circle, when it reaches the topmost point, its velocity becomes zero but due to its inertia, it will fall in forward direction and completes the circle.

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