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Một tàu cao tốc đang di chuyển ở tốc độ 50 m/s hướng về một chiếc phao cách đó 100 m. Tài xếbắt đầu hãm tốc với gia tốc -4 m/s2. Tính toán tốc độ tàu khi đến phao?

Sagot :

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