Hai chất điểm chuyển động trên cùng một đường thẳng với các vận tốc đầu v1 ; v2 ngược chiều nhau, hướng đến với nhau.Gia tốc của chúng không thay đổi và ngược chiều với các vận tốc đầu tương ứng.Độ lớn các gia tốc a1, a2.Khoảng cách ban đầu giữa hai chất điểm có giá trị nhỏ nhất bằng bao nhiêu để chúng không gặp nhau khi chuyển động? Đs: (v1+v2)^2 / 2(a1+a2)

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