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Two pendulums of length 121 cm and 100 cm is start vibrating in phase. At some instant, the two are at their mean position in the same phase. The minimum number of vibrations of the sorter pendulum after which the two are again in phase at the mean position is :

(1) 8

(2) 11

(3) 9

(4) 10

1 Answer

Best answer
(2) 11

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