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tieuhocanbaiqp
2 năm trước
Mọi người giúp em câu này với ạ 1.một vật đang chuyển động thẳng với vận tốc v. muốn vật chuyển động theo phương cũ và chuyển động nhanh lên thì ra phải tác dụng một lực như thế nào vào vật ? hãy chọn câu trả lời đúng. a.cùng phương cùng chiều với vận tốc b. cùng phương ngược chiều với vận tốc c. có phương vuông góc với vận tốc d. có phương bất kì số với vận tốc
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