Một tàu mô hình gia tốc từ trạng thái nghỉ đến 0.620 m/s trong khoảng thời gian 21.0 ms. Khối lượng của tàu là 875 g. (a) Tìm công suất trung bình tối thiểu của động cơ cung cấp cho tàu trong quá trình gia tốc. (b) Công suất trung bình tối thiểu ở câu (a) nghĩa là gì?

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