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Physics, 21.08.2021 16:10 davidoj13

một viên đá được cột vào đầu sợi dây dài 0,5m rồi quay sợi dây cho viên đá chuyển động tròn đều sao cho mỗi giây nó thực hiện được 2 vòng, gia tốc của viên đá là

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một viên đá được cột vào đầu sợi dây dài 0,5m rồi quay sợi dây cho viên đá chuyển động tròn đều sao...
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