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Time Period of Pendulum

Question

Two pendulums of lengths 121 cm and 100 cm start vibrating at the same instant. They are in the mean position and in the same phase. After how many vibrations of the shorter pendulum, the two will be in the same phase in the mean position?
10 vibrations
11 vibrations
21 vibrations
20 vibrations

A

10 vibrations

B

20 vibrations

C

21 vibrations

D

11 vibrations

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