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lonely_h2508


mot vat co khoi luong M = 250g , dang can bang khi treo duoi 1 lo xo co do cung 50N/m. nguoi ta dat nhe nhang len vat treo 1 vat co khoi luong m thi ca 2 bat dau dao dong dieu hoa tren phuong thang dung va khi cach vi tri ban dau 2 cm thi chung co toc do la 40 m/s.lay g = 10 m/s^2. hoi khoi luong m la bao nhieu?:-SS:-SS:-SS
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