Two pendulums with identical bobs and lengths are suspended from a common support such that in r...

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Two pendulums with identical bobs and lengths are suspended from a common support such that in rest position the two bobs are in contact (figure). After being displaced by \( 5^{\circ} \) the bob \( \mathrm{A} \) is released from rest, at \( \mathrm{t}=0 \) subsequently it collides elastically head-on with the other bob. The graph showing variation in energy of pendulum \( A \) with time, for \( 0 \leq t \leq T \) (where \( T \) is the period of either - pendulum) is .
(1)
(
(3)
(4) \( \underbrace{\frac{3}{4} T}_{\frac{T}{4}} \)
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