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Physics, 10.12.2021 02:50 KariSupreme

Bắt đầu từ trạng thái nghỉ, một DVD tăng tốc đều đến 450 vòng/phút trong 1 s, quay với tốc độ góc này trong 3 s, sau đó giảm đều xuống đến khi dừng lại trong 2 s. Xác định số vòng quay của đĩa DVD?

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