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The string of pendulum of length l is di...

The string of pendulum of length l is displaced through `90^(@)` from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is

A

`mg`

B

`3mg`

C

`5 mg`

D

`6 mg`

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The correct Answer is:
B
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