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A simple pendulum is released from A as ...

A simple pendulum is released from A as shown. If m and 1 represent the mass of the bob and length of the pendulum, the gain kinetic energy at B is

A

`(mg1)/(2)`

B

`(mg1)/(sqrt(2))`

C

`(sqrt(3))/(2)mg1`

D

`(2)/(sqrt(3))mg1`

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