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In the situation shown, a pendulum bob o...

In the situation shown, a pendulum bob of mass m and length L is taken aside and released from rest from the angular position `theta` as shown. If the mass takes time t to reach the lowest point. Find the magnitude of impulse of tension (in the string) on mass m from time t=0 to t.

A

`msqrt(2gL(1-costheta))`

B

`msqrt(g^(2)t^(2)2gL(1-cos theta))`

C

`2mgL(1-cos theta)`

D

`-2mgL(1-costheta)`

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