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hongthamvp
2 năm trước
trường hợp nào sau đây công của lực = 0: a. lực vuông góc với phương chuyển động của vật b. lực cùng phương với phương chuyển động c. lực hợp với phương chuyển động một góc lớn hơn một góc 90 d. lực hợp với phương chuyển động một góc nhỏ hơn một góc 90
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