IMAT 2022 Q 60 pendulum simple harmonic motion


I do not understand how to find the correct answer A) 1,0m.
Any help to find my mistake is greatly appreciated.

hi you just got the period wrong it should be T=2s because when it swings backward it passes once through the vertical line which takes 1s and forward another 1s so you have 2s total for 1 cycle. everything else is correct.

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