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benohy2005
2 năm trước
Một người dùng dây kéo một vật có khối lượng 100kg trượt trên mặt sàn nằm ngang với lực kéo Facebook= 100√3 N. Dây nghiêng chếch lên một góc 30° số với phương ngang. Hệ số mà sát giữa vật với sàn là 0,05 . Sau 4s đạt được vận tốc bằng bao nhiêu?
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