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ngotruonghuycorn
2 năm trước
hai hòn bi có kl m1=400g và m2=800kg chuyển động ngược chiều nhau trên mặt ngang với các vận tốc tương ứng v1=1m/s và v2=2m/s sau khi va cham hai hòn bi dính nhau và chuyển động cùng vận tốc bỏ qua lực cản tính độ lớn vận tốc sau va chạm của hai hòn bi
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