শ্রেণিঃ একাদশ, বিষয়ঃ পদার্থবিজ্ঞান প্রথম পত্র, অধ্যায়ঃ নিউটনিয়ান বলবিদ্যা (৪), তারিখঃ ২৮-১২-২০২০

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