20. Một viên bi được thả lăn từ đỉnh một mặt phẳng nghiêng với vận tốc ban đầu là 2 m/s và chuyển động nhanh dần đều với gia tốc 20 cm/s2 . Hỏi sau bao lâu viên bi đạt được vận tốc 3m/s.
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