Bài 3 : Xe 1 chuyển động với vận tốc 10m/s đến va chạm vào xe 2 đang chuyển động cùng chiều với vận tốc 7m/s. Biết sau va chạm hai xe dính vào nhau cùng chuyển động theo chiều ban đầu với vận tốc 8m/s. Biết khối lượng của xe 2 là 150 kg. Tìm khối lượng xe 1.

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