Một vật có khối lượng 2kg trượt qua A với vận tốc 2m/s xuống dốc nghiêng AB dài 2m, cao lm. Biết hệ số ma sát giữa vật và mặt phẳng nghiêng là = . lấy g = 10ms2. a) Xác định công của trọng lực, công của lực ma sát thực hiện khi vật chuyển dời từ dinh dốc đến chân dốc. b)Xác định vận tốc của vật tại chân dốc B.

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