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2 năm trước
một vật dao dộng điều hòa với biên độ A=5cm và chu kỳ T. trong 1 chu kỳ độ lớn gia tốc của vật không vượt quá 100 cm/s^2 trong khoảng thời gian t = T/3. tính chu kỳ dao động T
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