A point mass m is moved in vertical circ...

A point mass m is moved in vertical circle of radius r with help of string. Velocity of mass is `root(7gr)` at lowest point. Tension in string at lowest point is

7 mg

8 mg

1 mg

6 mg

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The correct Answer is:

According to the given question
`T-mg=m((sqrt(7gr))^2)/(r)`
`implies` T=8 mg

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