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sirtuanvfu
2 năm trước
Bài 3: Một thang máy có khối lượng m = 1 tấn chuyên động nhanh dần đều lên cao với gia tốc 2m/s2 . Tính công mà động cơ thang máy đã thực hiện trong 3s đầu. Lấy g = 10m/s2
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