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Question

A simple pendulum is suspended from the fixed point and m is mass of bob. When the bob is at the lowest position, the bob is given a minimum velocity in horizontal direction so that the bob describes vertical circle. When the string is horizontal, the tension in it is:
  1. 9mg2
  2. 6mg
  3. 3mg2
  4. 3mg

A
6mg
B
9mg2
C
3mg2
D
3mg
Solution
Verified by Toppr

Velocityatlowestpoint=5gL

Now apply energy conservation between bottom(1) and horizontal(2) point;
12mv2212mv21=mg(L)

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