1 vật khối lượng 5kg được ném theo phương thẳng đứng từ mặt đất lên với vận tốc 50m/s lấy g=10m/s^2 a, tính cơ năng của vật b, tính độ cao từng đoạn của vật c, xác định vị trí của vạt có vận tốc 20m/s Mọi người ơi giúp em với ạ:(((( em cảm ơn mọi người nhiều lắm ❤️

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