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khoahoctunhien2at
2 năm trước
Một xe máy chuyển động trên đoạn đg thứ nhất dài 40km với vận tốc ko đổi 10m/s trên đoạn đg thứ 2 với vận tốc ko đổi 54km/h trong thời gian t2 là 1,5h tính vt trung bình của xe máy trên cả quãng đường (mọi ng cố gắng giúp mình với)
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