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A pendulum of length l=1m is released fr...

A pendulum of length `l=1m` is released from `theta_(0)=60^(@)` . The rate of change of speed of the bob at `theta=30^(@)` is.

A

`10 ms^(-2)`

B

`7.5 ms^(-2)`

C

`5 ms^(-2)`

D

`5sqrt(3) ms^(-2)`

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The correct Answer is:
C
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