A point mass \(m\) is moved in a vertical circle of radius \(r\) with the help of a string. The velocity of the mass is \(\sqrt{7gr} \) at the lowest point. The tension in the string at the lowest point is:

1. \(6 \text{mg}\) 2. \(7 \text{mg}\)
3. \(8 \text{mg}\) 4. \( \text{mg}\)
Subtopic:  Non Uniform Vertical Circular Motion |
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