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2 năm trước
Một vật dao động điều hòa với phương trình gia tốc: a = 2cos(2πt + 5π/6)m/s2. Lấy π2≈ 10. Tại t = 0 vật có vận tốc: (gấp lắm mng ơi) A. -250 cm/s B.5π cm/s C. 250 cm/s D.-5π cm/s
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