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a-level physics question

Someone please explain how you work it out. The answer is 38s.

A simple pendulum of time period 1.90 s is set up alongside another pendulum of time period 2.00 s. The pendulums are displaced in the same direction and released at the same time.
Calculate the time interval until they next move in phase. Explain how you arrive at your answer.
Sorry you've not had any responses about this. :frown: Are you sure you've posted in the right place? :smile: Here's a link to our subject forum which should help get you more responses if you post there. :redface:


Just quoting in Danny Dorito so she can move the thread if needed :wizard:

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