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chap19 system in simple harmic motion-1.ppt
chap20 Electromagnetic waves-1 - Copy.ppt
chap19 Simple Haonic Motion1-update.pptx
chap19 Simple Harmonic MoNNNNtion1-1.ppt
chap19 dampedEDEDEDEEDEDDEDEDEED OSC.ppt