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thuychi30032008
2 năm trước
Một vật dao động điều hòa với tốc độ cực đại là $10$$\pi$ $cm/s$. Ban đầu vật đứng ở vị trí có vận tốc là $5$$\pi$ $cm/s$ và thời gian ngắn nhất để vật đi từ vị trí trên đến vị trí có vận tốc $v=0$ là $0,1s$. Hãy viết phương trình dao động của vật?
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