WEBVTT

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Xin chào.

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Hôm nay chúng ta sẽ học thêm 
về động lượng.

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Với bài tập đầu tiên, 
một người trượt băng

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đang ở trên một đường băng.

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Cô ấy đang cầm một quả bóng.

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Qủa bóng này-- tôi sẽ 
vẽ nó-- nặng

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0,15 kg.

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Cô ấy ném nó.

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Đề bài cho cô ấy ném nó

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