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hoanglinh2281985
2 năm trước
1. Một vật có khối lượng 400g được thả rơi tự do từ độ cao 20m so với mặt đất.Cho g=10 m/s2. Sau khi rơi dc 12m động năng của vạt bằng 2.hai xe gòng chở than cùng chuyển động trên 2 tuyến đường ray song song nhau với wđ1 = 1/7 wđ2 . Nếu xe 1 giảm vận tốc đi 3m/s thì wđ 1= wđ 2 .Tìm vận tốc v1 , v2
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