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Class 1 | পদার্থবিজ্ঞান ১ম পত্রঃ অধ্যায়-৪- নিউটনীয় বলবিদ্যা- লেকচার ১ঃ বল, জড়তা, নিউটনের প্রথম ও দ্বিতীয় সূত্র

HRI Team

31 May, 2022

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