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thuylamson
2 năm trước
Một lò xo nhẹ độ cứng k khi treo một vật nhỏ khối lượng m 100 g thì dãn một đoạn 1 cm. Treo hệ lò xo và vật vào trần thang máy đang đi lên với gia tốc / 2 a 5 m s . Độ dãn của lò xo khi đó A. 5 (cm). B. 2,5 (cm). C. 1,5(cm). D. 0,5(cm).
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