Question

The string of a pendulum is horizontal. The mass of the bob is m. Now the string is released. The tension in the string in the lowest position is -

Answer 1

Answer:

the tension in the string in the lower position is 3mg

Answer 2

Answer:

By conservation of energy,

$v = \sqrt{2gr}$

T =

$\frac{m {v}^{2} }{l} + mg$

$= 2mg + mg$

$= 3mg$

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