Trieutien Trieutien

12-10-2022
Physics

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Một người đi xe đạp qua quãng đường S từ A đến B gồm ba đoạn: s = S1 + $2 + $3, Thời gian và vận tốc trên các đoạn là t1, t2, t3 và v1= 20(km/h), v2= 15(km/h), V3= 10(km/h). Tính vận tốc trung bình trên quãng đường s. Xét 2 trường hợp: a) s1=s2=s3 b) t1=t2=t3

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