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thach2k1
2 năm trước
Đề : Thả một vật rơi từ độ cao 45m so với mặt đất , g=10m/s^2 . Bỏ qua sức cản của KK . a). Tính vận tốc của vật khi vật chạm đất . b). Tính độ cao của vật khi Wđ= 2Wt c). Khi chạm đất , do đất mềm nên vật bị lún sâu 10cm . Tính lực cản trung binh tác dụng lên vật , cho m=100g. Giải hộ e !
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