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Two pendulums of length 1.21 m and 1.0 m...

Two pendulums of length 1.21 m and 1.0 m starts vibrationg. At some instant, the two are in the mean position in same phase. After how many vibrations of the longer pendulum, the two will be in phase ?

A

10

B

11

C

20

D

21

Text Solution

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The correct Answer is:
A
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