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taijutsu1112003
2 năm trước
bài1.người ta dùng một cần cẩu để nâng một thùng hàng có trọng lượng 35 000N lên cao 1m. Tính công thực hiện được trong trường hợp này. bài2. Một vật trọng lượng 2N trượt trên mặt bàn nằm ngang được 0,5m.Tính công của trọng lực bài3.tính công của lực nâng búa máy có khối lượng 15 tấn lên cao 5000cm. trả lời vs cần gấp
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