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  4. 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 √7 gr at the lowest point. The tension in the string at the lowest point is :

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Q. 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 $\sqrt{7\,gr}$ at the lowest point. The tension in the string at the lowest point is :

NEETNEET 2020Work, Energy and Power

Solution:

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$T-mg = \frac{m\left(\sqrt{7\,gr}\right)^{2}}{r}$
$T=8\,mg$