Physics, 24.09.2021 01:20 tonyiacamper1
Một chất điểm dao động điều hoà với phương trình: x = 6 cos(20t+ Pi ) (cm), trong đó thời gian t được tính bằng giây. Khi chất điểm có li độ 2 cm thì tốc độ của nó Là
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Một chất điểm dao động điều hoà với phương trình: x = 6 cos(20t+ Pi ) (cm), trong đó thời gian t đượ...
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