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khangkhangg2002
2 năm trước
Một người kéo vật có khối lượng 20kg lên cao 2,5m bằng 1 mặt phẳng nghiêng dài 10m mất 17 giây. Tính công suất của người đó biết lực cản trong quá trình chuyển động là 18N
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