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nguyenngocanhthutb19
2 năm trước
Câu 5: Người ta dùng một mặt phẳng nghiêng có chiều dài 5m để kéo một vật có khối lượng 300kg với lực kéo 1200N . Biết hiệu suất của mặt phẳng nghiêng là 80%. Tính chiều cao của mặt phẳng nghiêng? Câu 6: Một con ngựa kéo xe chuyển động đều với lực kéo là 600N. Trong 5 phút công thực hiện được là 360kJ. Tính tốc độ của xe.
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