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2 năm trước
Một vật m = 5kg trượt từ đỉnh mặt phẳng nghiêng dài 20m, góc nghiêng 300 so với phương ngang. Công của trọng lực khi vật đi hết dốc là: A. - 500J. B. 850J. C. 0,5kJ. D. 100J.
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