A metre rule 100cm long has a weight of 20N. Its supported at 20cm from one end.which weight should be placed on the lighter end so that the metre rule balances? - The Physics Trivia câu hỏi kiểm tra

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A metre rule 100cm long has a weight of 20N. Its supported at 20cm from one end.which weight should be placed on the lighter end so that the metre rule balances?

Choose the right answer:

30N

25N

35N

12N

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