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Race of Rollers

A bob is susp...

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A bob is suspended from a peg on a wall by a massless string of length L. If it is given a velocity \sqrt{2gL} at the lowest point, then angular amplitude with which body will oscillate is- 1. 60^0, 2. 90^{0 }, 3. 75^{0 },4. 30^{0 }

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