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MHT CET Physics question

PhysicsOscillationsMHT CET

Two pendulums of length 121 cm and 100 cm start vibrating. At same instant, the two are in the mean position in the same phase. After how many vibrations of the shorter pendulum, the two will be in phase at the mean position?

Answer: (B)

Solution

; the shorter pendulum gains one full oscillation when it has made n vibrations and the longer :

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Question ID VK-068267