# 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 √7gr

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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) 1 mg

(2) 6 mg

(3) 7 mg

(4) 8 mg

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