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Một chiếc xe chở đầy cát khối lượng M =10 kg chuyển động không ma sát
trên đường nằm ngang với vận tốc v1 = 1 m/s, va chạm mềm với một quả cầu khối
lượng m = 2kg đang bay theo chiều ngược lại với vận tốc v2 = 7m/s. Xác định
véctơ vận tốc của xe và quả cầu sau va chạm.
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Một chiếc xe chở đầy cát khối lượng M =10 kg chuyển động không ma sát
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