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A small sphere tied to the string of len...

A small sphere tied to the string of length `0.8m` is describing a vertical circle so that the maximum and minimum tensions in the string are in the ratio `3:1`. The fixed end of the string is at a height of `5.8m` above ground.
(a) Find the velocity of the sphere at the lowest position.

(b) If the string suddenly breaks at the lowest position, when and where will the sphere hit the ground?

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