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tonvu1405
2 năm trước
Một vật có khối lượng 200g ở đỉnh một mặt phẳng nghiêng dài 10m nghiêng góc 30 0 so với mặt phẳng nằm ngang. Lấy g=10m/s 2 . Chọn mốc thế năng tại chân mặt phẳng nghiêng. Thế năng của vật là A.5J. B.10J. C.10 3 J. D.20J.
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