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Question

A body of mass, m, is rotated in a vertical circle of radius, R, by means of a light string. If the velocity of body is 5gR at the lowest point of vertical circle, then tension in the string is:
  1. 3 mg
  2. 2 mg
  3. 4 mg
  4. 6 mg

A
2 mg
B
3 mg
C
4 mg
D
6 mg
Solution
Verified by Toppr

At lowest point, tension acts in upward direction, weight, mg, in downward direction.
Tmg provides necessary centripetal force.
Tmg=mν2R
T=6mg

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