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Constrained Motion : General Approach

A pendulum in...

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A pendulum in vertical plane having length of stringI and mass of bob m is kept horizontal. Now the bob-is released from horizontal position. The tension instring when it makes an angle of 60^° with vertical

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Q. The string of a pendulum is horizontal initially. The mass of the bob attached is m. Now the string is released. 'R' is the length of the pendulum.
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