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mindyphan2608
2 năm trước
Một vật được đẩy nhẹ để trượt xuống từ đỉnh một mặt phẳng nghiêng có góc nghiêng 230 . Muốn vật trượt với tốc độ không đổi thì hệ số ma sát trượt giữa vật với mặt nghiêng bằng A. 0,39. B. 0,50. C. 0,92. D. 0,42.
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