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Vẽ sơ đồ dùng hệ thống ròng rọc để đứng dưới đất kéo một vật 50 kg lên cao với lực kéo chỉ bằng 1/4 trọng lượng của vật biết hệ thống này có số ròng rọc ít nhất trọng lượng của ròng rọc và dây kéo không đáng kể
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